Python/Python-ast.c

/* File automatically generated by Parser/asdl_c.py. */

#include <stddef.h>

#include "Python.h"
#include "Python-ast.h"

static PyTypeObject AST_type;
static PyTypeObject *mod_type;
static PyObject* ast2obj_mod(void*);
static PyTypeObject *Module_type;
_Py_IDENTIFIER(body);
static char *Module_fields[]={
    "body",
};
static PyTypeObject *Interactive_type;
static char *Interactive_fields[]={
    "body",
};
static PyTypeObject *Expression_type;
static char *Expression_fields[]={
    "body",
};
static PyTypeObject *Suite_type;
static char *Suite_fields[]={
    "body",
};
static PyTypeObject *stmt_type;
_Py_IDENTIFIER(lineno);
_Py_IDENTIFIER(col_offset);
static char *stmt_attributes[] = {
    "lineno",
    "col_offset",
};
static PyObject* ast2obj_stmt(void*);
static PyTypeObject *FunctionDef_type;
_Py_IDENTIFIER(name);
_Py_IDENTIFIER(args);
_Py_IDENTIFIER(decorator_list);
_Py_IDENTIFIER(returns);
static char *FunctionDef_fields[]={
    "name",
    "args",
    "body",
    "decorator_list",
    "returns",
};
static PyTypeObject *ClassDef_type;
_Py_IDENTIFIER(bases);
_Py_IDENTIFIER(keywords);
_Py_IDENTIFIER(starargs);
_Py_IDENTIFIER(kwargs);
static char *ClassDef_fields[]={
    "name",
    "bases",
    "keywords",
    "starargs",
    "kwargs",
    "body",
    "decorator_list",
};
static PyTypeObject *Return_type;
_Py_IDENTIFIER(value);
static char *Return_fields[]={
    "value",
};
static PyTypeObject *Delete_type;
_Py_IDENTIFIER(targets);
static char *Delete_fields[]={
    "targets",
};
static PyTypeObject *Assign_type;
static char *Assign_fields[]={
    "targets",
    "value",
};
static PyTypeObject *AugAssign_type;
_Py_IDENTIFIER(target);
_Py_IDENTIFIER(op);
static char *AugAssign_fields[]={
    "target",
    "op",
    "value",
};
static PyTypeObject *For_type;
_Py_IDENTIFIER(iter);
_Py_IDENTIFIER(orelse);
static char *For_fields[]={
    "target",
    "iter",
    "body",
    "orelse",
};
static PyTypeObject *While_type;
_Py_IDENTIFIER(test);
static char *While_fields[]={
    "test",
    "body",
    "orelse",
};
static PyTypeObject *If_type;
static char *If_fields[]={
    "test",
    "body",
    "orelse",
};
static PyTypeObject *With_type;
_Py_IDENTIFIER(items);
static char *With_fields[]={
    "items",
    "body",
};
static PyTypeObject *Raise_type;
_Py_IDENTIFIER(exc);
_Py_IDENTIFIER(cause);
static char *Raise_fields[]={
    "exc",
    "cause",
};
static PyTypeObject *Try_type;
_Py_IDENTIFIER(handlers);
_Py_IDENTIFIER(finalbody);
static char *Try_fields[]={
    "body",
    "handlers",
    "orelse",
    "finalbody",
};
static PyTypeObject *Assert_type;
_Py_IDENTIFIER(msg);
static char *Assert_fields[]={
    "test",
    "msg",
};
static PyTypeObject *Import_type;
_Py_IDENTIFIER(names);
static char *Import_fields[]={
    "names",
};
static PyTypeObject *ImportFrom_type;
_Py_IDENTIFIER(module);
_Py_IDENTIFIER(level);
static char *ImportFrom_fields[]={
    "module",
    "names",
    "level",
};
static PyTypeObject *Global_type;
static char *Global_fields[]={
    "names",
};
static PyTypeObject *Nonlocal_type;
static char *Nonlocal_fields[]={
    "names",
};
static PyTypeObject *Expr_type;
static char *Expr_fields[]={
    "value",
};
static PyTypeObject *Pass_type;
static PyTypeObject *Break_type;
static PyTypeObject *Continue_type;
static PyTypeObject *expr_type;
static char *expr_attributes[] = {
    "lineno",
    "col_offset",
};
static PyObject* ast2obj_expr(void*);
static PyTypeObject *BoolOp_type;
_Py_IDENTIFIER(values);
static char *BoolOp_fields[]={
    "op",
    "values",
};
static PyTypeObject *BinOp_type;
_Py_IDENTIFIER(left);
_Py_IDENTIFIER(right);
static char *BinOp_fields[]={
    "left",
    "op",
    "right",
};
static PyTypeObject *UnaryOp_type;
_Py_IDENTIFIER(operand);
static char *UnaryOp_fields[]={
    "op",
    "operand",
};
static PyTypeObject *Lambda_type;
static char *Lambda_fields[]={
    "args",
    "body",
};
static PyTypeObject *IfExp_type;
static char *IfExp_fields[]={
    "test",
    "body",
    "orelse",
};
static PyTypeObject *Dict_type;
_Py_IDENTIFIER(keys);
static char *Dict_fields[]={
    "keys",
    "values",
};
static PyTypeObject *Set_type;
_Py_IDENTIFIER(elts);
static char *Set_fields[]={
    "elts",
};
static PyTypeObject *ListComp_type;
_Py_IDENTIFIER(elt);
_Py_IDENTIFIER(generators);
static char *ListComp_fields[]={
    "elt",
    "generators",
};
static PyTypeObject *SetComp_type;
static char *SetComp_fields[]={
    "elt",
    "generators",
};
static PyTypeObject *DictComp_type;
_Py_IDENTIFIER(key);
static char *DictComp_fields[]={
    "key",
    "value",
    "generators",
};
static PyTypeObject *GeneratorExp_type;
static char *GeneratorExp_fields[]={
    "elt",
    "generators",
};
static PyTypeObject *Yield_type;
static char *Yield_fields[]={
    "value",
};
static PyTypeObject *YieldFrom_type;
static char *YieldFrom_fields[]={
    "value",
};
static PyTypeObject *Compare_type;
_Py_IDENTIFIER(ops);
_Py_IDENTIFIER(comparators);
static char *Compare_fields[]={
    "left",
    "ops",
    "comparators",
};
static PyTypeObject *Call_type;
_Py_IDENTIFIER(func);
static char *Call_fields[]={
    "func",
    "args",
    "keywords",
    "starargs",
    "kwargs",
};
static PyTypeObject *Num_type;
_Py_IDENTIFIER(n);
static char *Num_fields[]={
    "n",
};
static PyTypeObject *Str_type;
_Py_IDENTIFIER(s);
static char *Str_fields[]={
    "s",
};
static PyTypeObject *Bytes_type;
static char *Bytes_fields[]={
    "s",
};
static PyTypeObject *NameConstant_type;
static char *NameConstant_fields[]={
    "value",
};
static PyTypeObject *Ellipsis_type;
static PyTypeObject *Attribute_type;
_Py_IDENTIFIER(attr);
_Py_IDENTIFIER(ctx);
static char *Attribute_fields[]={
    "value",
    "attr",
    "ctx",
};
static PyTypeObject *Subscript_type;
_Py_IDENTIFIER(slice);
static char *Subscript_fields[]={
    "value",
    "slice",
    "ctx",
};
static PyTypeObject *Starred_type;
static char *Starred_fields[]={
    "value",
    "ctx",
};
static PyTypeObject *Name_type;
_Py_IDENTIFIER(id);
static char *Name_fields[]={
    "id",
    "ctx",
};
static PyTypeObject *List_type;
static char *List_fields[]={
    "elts",
    "ctx",
};
static PyTypeObject *Tuple_type;
static char *Tuple_fields[]={
    "elts",
    "ctx",
};
static PyTypeObject *expr_context_type;
static PyObject *Load_singleton, *Store_singleton, *Del_singleton,
*AugLoad_singleton, *AugStore_singleton, *Param_singleton;
static PyObject* ast2obj_expr_context(expr_context_ty);
static PyTypeObject *Load_type;
static PyTypeObject *Store_type;
static PyTypeObject *Del_type;
static PyTypeObject *AugLoad_type;
static PyTypeObject *AugStore_type;
static PyTypeObject *Param_type;
static PyTypeObject *slice_type;
static PyObject* ast2obj_slice(void*);
static PyTypeObject *Slice_type;
_Py_IDENTIFIER(lower);
_Py_IDENTIFIER(upper);
_Py_IDENTIFIER(step);
static char *Slice_fields[]={
    "lower",
    "upper",
    "step",
};
static PyTypeObject *ExtSlice_type;
_Py_IDENTIFIER(dims);
static char *ExtSlice_fields[]={
    "dims",
};
static PyTypeObject *Index_type;
static char *Index_fields[]={
    "value",
};
static PyTypeObject *boolop_type;
static PyObject *And_singleton, *Or_singleton;
static PyObject* ast2obj_boolop(boolop_ty);
static PyTypeObject *And_type;
static PyTypeObject *Or_type;
static PyTypeObject *operator_type;
static PyObject *Add_singleton, *Sub_singleton, *Mult_singleton,
*Div_singleton, *Mod_singleton, *Pow_singleton, *LShift_singleton,
*RShift_singleton, *BitOr_singleton, *BitXor_singleton, *BitAnd_singleton,
*FloorDiv_singleton;
static PyObject* ast2obj_operator(operator_ty);
static PyTypeObject *Add_type;
static PyTypeObject *Sub_type;
static PyTypeObject *Mult_type;
static PyTypeObject *Div_type;
static PyTypeObject *Mod_type;
static PyTypeObject *Pow_type;
static PyTypeObject *LShift_type;
static PyTypeObject *RShift_type;
static PyTypeObject *BitOr_type;
static PyTypeObject *BitXor_type;
static PyTypeObject *BitAnd_type;
static PyTypeObject *FloorDiv_type;
static PyTypeObject *unaryop_type;
static PyObject *Invert_singleton, *Not_singleton, *UAdd_singleton,
*USub_singleton;
static PyObject* ast2obj_unaryop(unaryop_ty);
static PyTypeObject *Invert_type;
static PyTypeObject *Not_type;
static PyTypeObject *UAdd_type;
static PyTypeObject *USub_type;
static PyTypeObject *cmpop_type;
static PyObject *Eq_singleton, *NotEq_singleton, *Lt_singleton, *LtE_singleton,
*Gt_singleton, *GtE_singleton, *Is_singleton, *IsNot_singleton, *In_singleton,
*NotIn_singleton;
static PyObject* ast2obj_cmpop(cmpop_ty);
static PyTypeObject *Eq_type;
static PyTypeObject *NotEq_type;
static PyTypeObject *Lt_type;
static PyTypeObject *LtE_type;
static PyTypeObject *Gt_type;
static PyTypeObject *GtE_type;
static PyTypeObject *Is_type;
static PyTypeObject *IsNot_type;
static PyTypeObject *In_type;
static PyTypeObject *NotIn_type;
static PyTypeObject *comprehension_type;
static PyObject* ast2obj_comprehension(void*);
_Py_IDENTIFIER(ifs);
static char *comprehension_fields[]={
    "target",
    "iter",
    "ifs",
};
static PyTypeObject *excepthandler_type;
static char *excepthandler_attributes[] = {
    "lineno",
    "col_offset",
};
static PyObject* ast2obj_excepthandler(void*);
static PyTypeObject *ExceptHandler_type;
_Py_IDENTIFIER(type);
static char *ExceptHandler_fields[]={
    "type",
    "name",
    "body",
};
static PyTypeObject *arguments_type;
static PyObject* ast2obj_arguments(void*);
_Py_IDENTIFIER(vararg);
_Py_IDENTIFIER(kwonlyargs);
_Py_IDENTIFIER(kw_defaults);
_Py_IDENTIFIER(kwarg);
_Py_IDENTIFIER(defaults);
static char *arguments_fields[]={
    "args",
    "vararg",
    "kwonlyargs",
    "kw_defaults",
    "kwarg",
    "defaults",
};
static PyTypeObject *arg_type;
static PyObject* ast2obj_arg(void*);
static char *arg_attributes[] = {
    "lineno",
    "col_offset",
};
_Py_IDENTIFIER(arg);
_Py_IDENTIFIER(annotation);
static char *arg_fields[]={
    "arg",
    "annotation",
};
static PyTypeObject *keyword_type;
static PyObject* ast2obj_keyword(void*);
static char *keyword_fields[]={
    "arg",
    "value",
};
static PyTypeObject *alias_type;
static PyObject* ast2obj_alias(void*);
_Py_IDENTIFIER(asname);
static char *alias_fields[]={
    "name",
    "asname",
};
static PyTypeObject *withitem_type;
static PyObject* ast2obj_withitem(void*);
_Py_IDENTIFIER(context_expr);
_Py_IDENTIFIER(optional_vars);
static char *withitem_fields[]={
    "context_expr",
    "optional_vars",
};


typedef struct {
    PyObject_HEAD
    PyObject *dict;
} AST_object;

static void
ast_dealloc(AST_object *self)
{
    Py_CLEAR(self->dict);
    Py_TYPE(self)->tp_free(self);
}

static int
ast_traverse(AST_object *self, visitproc visit, void *arg)
{
    Py_VISIT(self->dict);
    return 0;
}

static void
ast_clear(AST_object *self)
{
    Py_CLEAR(self->dict);
}

static int
ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
{
    _Py_IDENTIFIER(_fields);
    Py_ssize_t i, numfields = 0;
    int res = -1;
    PyObject *key, *value, *fields;
    fields = _PyObject_GetAttrId((PyObject*)Py_TYPE(self), &PyId__fields);
    if (!fields)
        PyErr_Clear();
    if (fields) {
        numfields = PySequence_Size(fields);
        if (numfields == -1)
            goto cleanup;
    }
    res = 0; /* if no error occurs, this stays 0 to the end */
    if (PyTuple_GET_SIZE(args) > 0) {
        if (numfields != PyTuple_GET_SIZE(args)) {
            PyErr_Format(PyExc_TypeError, "%.400s constructor takes %s"
                         "%zd positional argument%s",
                         Py_TYPE(self)->tp_name,
                         numfields == 0 ? "" : "either 0 or ",
                         numfields, numfields == 1 ? "" : "s");
            res = -1;
            goto cleanup;
        }
        for (i = 0; i < PyTuple_GET_SIZE(args); i++) {
            /* cannot be reached when fields is NULL */
            PyObject *name = PySequence_GetItem(fields, i);
            if (!name) {
                res = -1;
                goto cleanup;
            }
            res = PyObject_SetAttr(self, name, PyTuple_GET_ITEM(args, i));
            Py_DECREF(name);
            if (res < 0)
                goto cleanup;
        }
    }
    if (kw) {
        i = 0;  /* needed by PyDict_Next */
        while (PyDict_Next(kw, &i, &key, &value)) {
            res = PyObject_SetAttr(self, key, value);
            if (res < 0)
                goto cleanup;
        }
    }
  cleanup:
    Py_XDECREF(fields);
    return res;
}

/* Pickling support */
static PyObject *
ast_type_reduce(PyObject *self, PyObject *unused)
{
    PyObject *res;
    _Py_IDENTIFIER(__dict__);
    PyObject *dict = _PyObject_GetAttrId(self, &PyId___dict__);
    if (dict == NULL) {
        if (PyErr_ExceptionMatches(PyExc_AttributeError))
            PyErr_Clear();
        else
            return NULL;
    }
    if (dict) {
        res = Py_BuildValue("O()O", Py_TYPE(self), dict);
        Py_DECREF(dict);
        return res;
    }
    return Py_BuildValue("O()", Py_TYPE(self));
}

static PyMethodDef ast_type_methods[] = {
    {"__reduce__", ast_type_reduce, METH_NOARGS, NULL},
    {NULL}
};

static PyGetSetDef ast_type_getsets[] = {
    {"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},
    {NULL}
};

static PyTypeObject AST_type = {
    PyVarObject_HEAD_INIT(&PyType_Type, 0)
    "_ast.AST",
    sizeof(AST_object),
    0,
    (destructor)ast_dealloc, /* tp_dealloc */
    0,                       /* tp_print */
    0,                       /* tp_getattr */
    0,                       /* tp_setattr */
    0,                       /* tp_reserved */
    0,                       /* tp_repr */
    0,                       /* tp_as_number */
    0,                       /* tp_as_sequence */
    0,                       /* tp_as_mapping */
    0,                       /* tp_hash */
    0,                       /* tp_call */
    0,                       /* tp_str */
    PyObject_GenericGetAttr, /* tp_getattro */
    PyObject_GenericSetAttr, /* tp_setattro */
    0,                       /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, /* tp_flags */
    0,                       /* tp_doc */
    (traverseproc)ast_traverse, /* tp_traverse */
    (inquiry)ast_clear,      /* tp_clear */
    0,                       /* tp_richcompare */
    0,                       /* tp_weaklistoffset */
    0,                       /* tp_iter */
    0,                       /* tp_iternext */
    ast_type_methods,        /* tp_methods */
    0,                       /* tp_members */
    ast_type_getsets,        /* tp_getset */
    0,                       /* tp_base */
    0,                       /* tp_dict */
    0,                       /* tp_descr_get */
    0,                       /* tp_descr_set */
    offsetof(AST_object, dict),/* tp_dictoffset */
    (initproc)ast_type_init, /* tp_init */
    PyType_GenericAlloc,     /* tp_alloc */
    PyType_GenericNew,       /* tp_new */
    PyObject_GC_Del,         /* tp_free */
};


static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int num_fields)
{
    PyObject *fnames, *result;
    int i;
    fnames = PyTuple_New(num_fields);
    if (!fnames) return NULL;
    for (i = 0; i < num_fields; i++) {
        PyObject *field = PyUnicode_FromString(fields[i]);
        if (!field) {
            Py_DECREF(fnames);
            return NULL;
        }
        PyTuple_SET_ITEM(fnames, i, field);
    }
    result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){sOss}",
                    type, base, "_fields", fnames, "__module__", "_ast");
    Py_DECREF(fnames);
    return (PyTypeObject*)result;
}

static int add_attributes(PyTypeObject* type, char**attrs, int num_fields)
{
    int i, result;
    _Py_IDENTIFIER(_attributes);
    PyObject *s, *l = PyTuple_New(num_fields);
    if (!l)
        return 0;
    for (i = 0; i < num_fields; i++) {
        s = PyUnicode_FromString(attrs[i]);
        if (!s) {
            Py_DECREF(l);
            return 0;
        }
        PyTuple_SET_ITEM(l, i, s);
    }
    result = _PyObject_SetAttrId((PyObject*)type, &PyId__attributes, l) >= 0;
    Py_DECREF(l);
    return result;
}

/* Conversion AST -> Python */

static PyObject* ast2obj_list(asdl_seq *seq, PyObject* (*func)(void*))
{
    Py_ssize_t i, n = asdl_seq_LEN(seq);
    PyObject *result = PyList_New(n);
    PyObject *value;
    if (!result)
        return NULL;
    for (i = 0; i < n; i++) {
        value = func(asdl_seq_GET(seq, i));
        if (!value) {
            Py_DECREF(result);
            return NULL;
        }
        PyList_SET_ITEM(result, i, value);
    }
    return result;
}

static PyObject* ast2obj_object(void *o)
{
    if (!o)
        o = Py_None;
    Py_INCREF((PyObject*)o);
    return (PyObject*)o;
}
#define ast2obj_singleton ast2obj_object
#define ast2obj_identifier ast2obj_object
#define ast2obj_string ast2obj_object
#define ast2obj_bytes ast2obj_object

static PyObject* ast2obj_int(long b)
{
    return PyLong_FromLong(b);
}

/* Conversion Python -> AST */

static int obj2ast_singleton(PyObject *obj, PyObject** out, PyArena* arena)
{
    if (obj != Py_None && obj != Py_True && obj != Py_False) {
        PyErr_SetString(PyExc_ValueError,
                        "AST singleton must be True, False, or None");
        return 1;
    }
    *out = obj;
    return 0;
}

static int obj2ast_object(PyObject* obj, PyObject** out, PyArena* arena)
{
    if (obj == Py_None)
        obj = NULL;
    if (obj) {
        if (PyArena_AddPyObject(arena, obj) < 0) {
            *out = NULL;
            return -1;
        }
        Py_INCREF(obj);
    }
    *out = obj;
    return 0;
}

static int obj2ast_identifier(PyObject* obj, PyObject** out, PyArena* arena)
{
    if (!PyUnicode_CheckExact(obj) && obj != Py_None) {
        PyErr_SetString(PyExc_TypeError, "AST identifier must be of type str");
        return 1;
    }
    return obj2ast_object(obj, out, arena);
}

static int obj2ast_string(PyObject* obj, PyObject** out, PyArena* arena)
{
    if (!PyUnicode_CheckExact(obj) && !PyBytes_CheckExact(obj)) {
        PyErr_SetString(PyExc_TypeError, "AST string must be of type str");
        return 1;
    }
    return obj2ast_object(obj, out, arena);
}

static int obj2ast_bytes(PyObject* obj, PyObject** out, PyArena* arena)
{
    if (!PyBytes_CheckExact(obj)) {
        PyErr_SetString(PyExc_TypeError, "AST bytes must be of type bytes");
        return 1;
    }
    return obj2ast_object(obj, out, arena);
}

static int obj2ast_int(PyObject* obj, int* out, PyArena* arena)
{
    int i;
    if (!PyLong_Check(obj)) {
        PyErr_Format(PyExc_ValueError, "invalid integer value: %R", obj);
        return 1;
    }

    i = (int)PyLong_AsLong(obj);
    if (i == -1 && PyErr_Occurred())
        return 1;
    *out = i;
    return 0;
}

static int add_ast_fields(void)
{
    PyObject *empty_tuple, *d;
    if (PyType_Ready(&AST_type) < 0)
        return -1;
    d = AST_type.tp_dict;
    empty_tuple = PyTuple_New(0);
    if (!empty_tuple ||
        PyDict_SetItemString(d, "_fields", empty_tuple) < 0 ||
        PyDict_SetItemString(d, "_attributes", empty_tuple) < 0) {
        Py_XDECREF(empty_tuple);
        return -1;
    }
    Py_DECREF(empty_tuple);
    return 0;
}

static int exists_not_none(PyObject *obj, _Py_Identifier *id)
{
    int isnone;
    PyObject *attr = _PyObject_GetAttrId(obj, id);
    if (!attr) {
        PyErr_Clear();
        return 0;
    }
    isnone = attr == Py_None;
    Py_DECREF(attr);
    return !isnone;
}


static int init_types(void)
{
    static int initialized;
    if (initialized) return 1;
    if (add_ast_fields() < 0) return 0;
    mod_type = make_type("mod", &AST_type, NULL, 0);
    if (!mod_type) return 0;
    if (!add_attributes(mod_type, NULL, 0)) return 0;
    Module_type = make_type("Module", mod_type, Module_fields, 1);
    if (!Module_type) return 0;
    Interactive_type = make_type("Interactive", mod_type, Interactive_fields,
                                 1);
    if (!Interactive_type) return 0;
    Expression_type = make_type("Expression", mod_type, Expression_fields, 1);
    if (!Expression_type) return 0;
    Suite_type = make_type("Suite", mod_type, Suite_fields, 1);
    if (!Suite_type) return 0;
    stmt_type = make_type("stmt", &AST_type, NULL, 0);
    if (!stmt_type) return 0;
    if (!add_attributes(stmt_type, stmt_attributes, 2)) return 0;
    FunctionDef_type = make_type("FunctionDef", stmt_type, FunctionDef_fields,
                                 5);
    if (!FunctionDef_type) return 0;
    ClassDef_type = make_type("ClassDef", stmt_type, ClassDef_fields, 7);
    if (!ClassDef_type) return 0;
    Return_type = make_type("Return", stmt_type, Return_fields, 1);
    if (!Return_type) return 0;
    Delete_type = make_type("Delete", stmt_type, Delete_fields, 1);
    if (!Delete_type) return 0;
    Assign_type = make_type("Assign", stmt_type, Assign_fields, 2);
    if (!Assign_type) return 0;
    AugAssign_type = make_type("AugAssign", stmt_type, AugAssign_fields, 3);
    if (!AugAssign_type) return 0;
    For_type = make_type("For", stmt_type, For_fields, 4);
    if (!For_type) return 0;
    While_type = make_type("While", stmt_type, While_fields, 3);
    if (!While_type) return 0;
    If_type = make_type("If", stmt_type, If_fields, 3);
    if (!If_type) return 0;
    With_type = make_type("With", stmt_type, With_fields, 2);
    if (!With_type) return 0;
    Raise_type = make_type("Raise", stmt_type, Raise_fields, 2);
    if (!Raise_type) return 0;
    Try_type = make_type("Try", stmt_type, Try_fields, 4);
    if (!Try_type) return 0;
    Assert_type = make_type("Assert", stmt_type, Assert_fields, 2);
    if (!Assert_type) return 0;
    Import_type = make_type("Import", stmt_type, Import_fields, 1);
    if (!Import_type) return 0;
    ImportFrom_type = make_type("ImportFrom", stmt_type, ImportFrom_fields, 3);
    if (!ImportFrom_type) return 0;
    Global_type = make_type("Global", stmt_type, Global_fields, 1);
    if (!Global_type) return 0;
    Nonlocal_type = make_type("Nonlocal", stmt_type, Nonlocal_fields, 1);
    if (!Nonlocal_type) return 0;
    Expr_type = make_type("Expr", stmt_type, Expr_fields, 1);
    if (!Expr_type) return 0;
    Pass_type = make_type("Pass", stmt_type, NULL, 0);
    if (!Pass_type) return 0;
    Break_type = make_type("Break", stmt_type, NULL, 0);
    if (!Break_type) return 0;
    Continue_type = make_type("Continue", stmt_type, NULL, 0);
    if (!Continue_type) return 0;
    expr_type = make_type("expr", &AST_type, NULL, 0);
    if (!expr_type) return 0;
    if (!add_attributes(expr_type, expr_attributes, 2)) return 0;
    BoolOp_type = make_type("BoolOp", expr_type, BoolOp_fields, 2);
    if (!BoolOp_type) return 0;
    BinOp_type = make_type("BinOp", expr_type, BinOp_fields, 3);
    if (!BinOp_type) return 0;
    UnaryOp_type = make_type("UnaryOp", expr_type, UnaryOp_fields, 2);
    if (!UnaryOp_type) return 0;
    Lambda_type = make_type("Lambda", expr_type, Lambda_fields, 2);
    if (!Lambda_type) return 0;
    IfExp_type = make_type("IfExp", expr_type, IfExp_fields, 3);
    if (!IfExp_type) return 0;
    Dict_type = make_type("Dict", expr_type, Dict_fields, 2);
    if (!Dict_type) return 0;
    Set_type = make_type("Set", expr_type, Set_fields, 1);
    if (!Set_type) return 0;
    ListComp_type = make_type("ListComp", expr_type, ListComp_fields, 2);
    if (!ListComp_type) return 0;
    SetComp_type = make_type("SetComp", expr_type, SetComp_fields, 2);
    if (!SetComp_type) return 0;
    DictComp_type = make_type("DictComp", expr_type, DictComp_fields, 3);
    if (!DictComp_type) return 0;
    GeneratorExp_type = make_type("GeneratorExp", expr_type,
                                  GeneratorExp_fields, 2);
    if (!GeneratorExp_type) return 0;
    Yield_type = make_type("Yield", expr_type, Yield_fields, 1);
    if (!Yield_type) return 0;
    YieldFrom_type = make_type("YieldFrom", expr_type, YieldFrom_fields, 1);
    if (!YieldFrom_type) return 0;
    Compare_type = make_type("Compare", expr_type, Compare_fields, 3);
    if (!Compare_type) return 0;
    Call_type = make_type("Call", expr_type, Call_fields, 5);
    if (!Call_type) return 0;
    Num_type = make_type("Num", expr_type, Num_fields, 1);
    if (!Num_type) return 0;
    Str_type = make_type("Str", expr_type, Str_fields, 1);
    if (!Str_type) return 0;
    Bytes_type = make_type("Bytes", expr_type, Bytes_fields, 1);
    if (!Bytes_type) return 0;
    NameConstant_type = make_type("NameConstant", expr_type,
                                  NameConstant_fields, 1);
    if (!NameConstant_type) return 0;
    Ellipsis_type = make_type("Ellipsis", expr_type, NULL, 0);
    if (!Ellipsis_type) return 0;
    Attribute_type = make_type("Attribute", expr_type, Attribute_fields, 3);
    if (!Attribute_type) return 0;
    Subscript_type = make_type("Subscript", expr_type, Subscript_fields, 3);
    if (!Subscript_type) return 0;
    Starred_type = make_type("Starred", expr_type, Starred_fields, 2);
    if (!Starred_type) return 0;
    Name_type = make_type("Name", expr_type, Name_fields, 2);
    if (!Name_type) return 0;
    List_type = make_type("List", expr_type, List_fields, 2);
    if (!List_type) return 0;
    Tuple_type = make_type("Tuple", expr_type, Tuple_fields, 2);
    if (!Tuple_type) return 0;
    expr_context_type = make_type("expr_context", &AST_type, NULL, 0);
    if (!expr_context_type) return 0;
    if (!add_attributes(expr_context_type, NULL, 0)) return 0;
    Load_type = make_type("Load", expr_context_type, NULL, 0);
    if (!Load_type) return 0;
    Load_singleton = PyType_GenericNew(Load_type, NULL, NULL);
    if (!Load_singleton) return 0;
    Store_type = make_type("Store", expr_context_type, NULL, 0);
    if (!Store_type) return 0;
    Store_singleton = PyType_GenericNew(Store_type, NULL, NULL);
    if (!Store_singleton) return 0;
    Del_type = make_type("Del", expr_context_type, NULL, 0);
    if (!Del_type) return 0;
    Del_singleton = PyType_GenericNew(Del_type, NULL, NULL);
    if (!Del_singleton) return 0;
    AugLoad_type = make_type("AugLoad", expr_context_type, NULL, 0);
    if (!AugLoad_type) return 0;
    AugLoad_singleton = PyType_GenericNew(AugLoad_type, NULL, NULL);
    if (!AugLoad_singleton) return 0;
    AugStore_type = make_type("AugStore", expr_context_type, NULL, 0);
    if (!AugStore_type) return 0;
    AugStore_singleton = PyType_GenericNew(AugStore_type, NULL, NULL);
    if (!AugStore_singleton) return 0;
    Param_type = make_type("Param", expr_context_type, NULL, 0);
    if (!Param_type) return 0;
    Param_singleton = PyType_GenericNew(Param_type, NULL, NULL);
    if (!Param_singleton) return 0;
    slice_type = make_type("slice", &AST_type, NULL, 0);
    if (!slice_type) return 0;
    if (!add_attributes(slice_type, NULL, 0)) return 0;
    Slice_type = make_type("Slice", slice_type, Slice_fields, 3);
    if (!Slice_type) return 0;
    ExtSlice_type = make_type("ExtSlice", slice_type, ExtSlice_fields, 1);
    if (!ExtSlice_type) return 0;
    Index_type = make_type("Index", slice_type, Index_fields, 1);
    if (!Index_type) return 0;
    boolop_type = make_type("boolop", &AST_type, NULL, 0);
    if (!boolop_type) return 0;
    if (!add_attributes(boolop_type, NULL, 0)) return 0;
    And_type = make_type("And", boolop_type, NULL, 0);
    if (!And_type) return 0;
    And_singleton = PyType_GenericNew(And_type, NULL, NULL);
    if (!And_singleton) return 0;
    Or_type = make_type("Or", boolop_type, NULL, 0);
    if (!Or_type) return 0;
    Or_singleton = PyType_GenericNew(Or_type, NULL, NULL);
    if (!Or_singleton) return 0;
    operator_type = make_type("operator", &AST_type, NULL, 0);
    if (!operator_type) return 0;
    if (!add_attributes(operator_type, NULL, 0)) return 0;
    Add_type = make_type("Add", operator_type, NULL, 0);
    if (!Add_type) return 0;
    Add_singleton = PyType_GenericNew(Add_type, NULL, NULL);
    if (!Add_singleton) return 0;
    Sub_type = make_type("Sub", operator_type, NULL, 0);
    if (!Sub_type) return 0;
    Sub_singleton = PyType_GenericNew(Sub_type, NULL, NULL);
    if (!Sub_singleton) return 0;
    Mult_type = make_type("Mult", operator_type, NULL, 0);
    if (!Mult_type) return 0;
    Mult_singleton = PyType_GenericNew(Mult_type, NULL, NULL);
    if (!Mult_singleton) return 0;
    Div_type = make_type("Div", operator_type, NULL, 0);
    if (!Div_type) return 0;
    Div_singleton = PyType_GenericNew(Div_type, NULL, NULL);
    if (!Div_singleton) return 0;
    Mod_type = make_type("Mod", operator_type, NULL, 0);
    if (!Mod_type) return 0;
    Mod_singleton = PyType_GenericNew(Mod_type, NULL, NULL);
    if (!Mod_singleton) return 0;
    Pow_type = make_type("Pow", operator_type, NULL, 0);
    if (!Pow_type) return 0;
    Pow_singleton = PyType_GenericNew(Pow_type, NULL, NULL);
    if (!Pow_singleton) return 0;
    LShift_type = make_type("LShift", operator_type, NULL, 0);
    if (!LShift_type) return 0;
    LShift_singleton = PyType_GenericNew(LShift_type, NULL, NULL);
    if (!LShift_singleton) return 0;
    RShift_type = make_type("RShift", operator_type, NULL, 0);
    if (!RShift_type) return 0;
    RShift_singleton = PyType_GenericNew(RShift_type, NULL, NULL);
    if (!RShift_singleton) return 0;
    BitOr_type = make_type("BitOr", operator_type, NULL, 0);
    if (!BitOr_type) return 0;
    BitOr_singleton = PyType_GenericNew(BitOr_type, NULL, NULL);
    if (!BitOr_singleton) return 0;
    BitXor_type = make_type("BitXor", operator_type, NULL, 0);
    if (!BitXor_type) return 0;
    BitXor_singleton = PyType_GenericNew(BitXor_type, NULL, NULL);
    if (!BitXor_singleton) return 0;
    BitAnd_type = make_type("BitAnd", operator_type, NULL, 0);
    if (!BitAnd_type) return 0;
    BitAnd_singleton = PyType_GenericNew(BitAnd_type, NULL, NULL);
    if (!BitAnd_singleton) return 0;
    FloorDiv_type = make_type("FloorDiv", operator_type, NULL, 0);
    if (!FloorDiv_type) return 0;
    FloorDiv_singleton = PyType_GenericNew(FloorDiv_type, NULL, NULL);
    if (!FloorDiv_singleton) return 0;
    unaryop_type = make_type("unaryop", &AST_type, NULL, 0);
    if (!unaryop_type) return 0;
    if (!add_attributes(unaryop_type, NULL, 0)) return 0;
    Invert_type = make_type("Invert", unaryop_type, NULL, 0);
    if (!Invert_type) return 0;
    Invert_singleton = PyType_GenericNew(Invert_type, NULL, NULL);
    if (!Invert_singleton) return 0;
    Not_type = make_type("Not", unaryop_type, NULL, 0);
    if (!Not_type) return 0;
    Not_singleton = PyType_GenericNew(Not_type, NULL, NULL);
    if (!Not_singleton) return 0;
    UAdd_type = make_type("UAdd", unaryop_type, NULL, 0);
    if (!UAdd_type) return 0;
    UAdd_singleton = PyType_GenericNew(UAdd_type, NULL, NULL);
    if (!UAdd_singleton) return 0;
    USub_type = make_type("USub", unaryop_type, NULL, 0);
    if (!USub_type) return 0;
    USub_singleton = PyType_GenericNew(USub_type, NULL, NULL);
    if (!USub_singleton) return 0;
    cmpop_type = make_type("cmpop", &AST_type, NULL, 0);
    if (!cmpop_type) return 0;
    if (!add_attributes(cmpop_type, NULL, 0)) return 0;
    Eq_type = make_type("Eq", cmpop_type, NULL, 0);
    if (!Eq_type) return 0;
    Eq_singleton = PyType_GenericNew(Eq_type, NULL, NULL);
    if (!Eq_singleton) return 0;
    NotEq_type = make_type("NotEq", cmpop_type, NULL, 0);
    if (!NotEq_type) return 0;
    NotEq_singleton = PyType_GenericNew(NotEq_type, NULL, NULL);
    if (!NotEq_singleton) return 0;
    Lt_type = make_type("Lt", cmpop_type, NULL, 0);
    if (!Lt_type) return 0;
    Lt_singleton = PyType_GenericNew(Lt_type, NULL, NULL);
    if (!Lt_singleton) return 0;
    LtE_type = make_type("LtE", cmpop_type, NULL, 0);
    if (!LtE_type) return 0;
    LtE_singleton = PyType_GenericNew(LtE_type, NULL, NULL);
    if (!LtE_singleton) return 0;
    Gt_type = make_type("Gt", cmpop_type, NULL, 0);
    if (!Gt_type) return 0;
    Gt_singleton = PyType_GenericNew(Gt_type, NULL, NULL);
    if (!Gt_singleton) return 0;
    GtE_type = make_type("GtE", cmpop_type, NULL, 0);
    if (!GtE_type) return 0;
    GtE_singleton = PyType_GenericNew(GtE_type, NULL, NULL);
    if (!GtE_singleton) return 0;
    Is_type = make_type("Is", cmpop_type, NULL, 0);
    if (!Is_type) return 0;
    Is_singleton = PyType_GenericNew(Is_type, NULL, NULL);
    if (!Is_singleton) return 0;
    IsNot_type = make_type("IsNot", cmpop_type, NULL, 0);
    if (!IsNot_type) return 0;
    IsNot_singleton = PyType_GenericNew(IsNot_type, NULL, NULL);
    if (!IsNot_singleton) return 0;
    In_type = make_type("In", cmpop_type, NULL, 0);
    if (!In_type) return 0;
    In_singleton = PyType_GenericNew(In_type, NULL, NULL);
    if (!In_singleton) return 0;
    NotIn_type = make_type("NotIn", cmpop_type, NULL, 0);
    if (!NotIn_type) return 0;
    NotIn_singleton = PyType_GenericNew(NotIn_type, NULL, NULL);
    if (!NotIn_singleton) return 0;
    comprehension_type = make_type("comprehension", &AST_type,
                                   comprehension_fields, 3);
    if (!comprehension_type) return 0;
    if (!add_attributes(comprehension_type, NULL, 0)) return 0;
    excepthandler_type = make_type("excepthandler", &AST_type, NULL, 0);
    if (!excepthandler_type) return 0;
    if (!add_attributes(excepthandler_type, excepthandler_attributes, 2))
        return 0;
    ExceptHandler_type = make_type("ExceptHandler", excepthandler_type,
                                   ExceptHandler_fields, 3);
    if (!ExceptHandler_type) return 0;
    arguments_type = make_type("arguments", &AST_type, arguments_fields, 6);
    if (!arguments_type) return 0;
    if (!add_attributes(arguments_type, NULL, 0)) return 0;
    arg_type = make_type("arg", &AST_type, arg_fields, 2);
    if (!arg_type) return 0;
    if (!add_attributes(arg_type, arg_attributes, 2)) return 0;
    keyword_type = make_type("keyword", &AST_type, keyword_fields, 2);
    if (!keyword_type) return 0;
    if (!add_attributes(keyword_type, NULL, 0)) return 0;
    alias_type = make_type("alias", &AST_type, alias_fields, 2);
    if (!alias_type) return 0;
    if (!add_attributes(alias_type, NULL, 0)) return 0;
    withitem_type = make_type("withitem", &AST_type, withitem_fields, 2);
    if (!withitem_type) return 0;
    if (!add_attributes(withitem_type, NULL, 0)) return 0;
    initialized = 1;
    return 1;
}

static int obj2ast_mod(PyObject* obj, mod_ty* out, PyArena* arena);
static int obj2ast_stmt(PyObject* obj, stmt_ty* out, PyArena* arena);
static int obj2ast_expr(PyObject* obj, expr_ty* out, PyArena* arena);
static int obj2ast_expr_context(PyObject* obj, expr_context_ty* out, PyArena*
                                arena);
static int obj2ast_slice(PyObject* obj, slice_ty* out, PyArena* arena);
static int obj2ast_boolop(PyObject* obj, boolop_ty* out, PyArena* arena);
static int obj2ast_operator(PyObject* obj, operator_ty* out, PyArena* arena);
static int obj2ast_unaryop(PyObject* obj, unaryop_ty* out, PyArena* arena);
static int obj2ast_cmpop(PyObject* obj, cmpop_ty* out, PyArena* arena);
static int obj2ast_comprehension(PyObject* obj, comprehension_ty* out, PyArena*
                                 arena);
static int obj2ast_excepthandler(PyObject* obj, excepthandler_ty* out, PyArena*
                                 arena);
static int obj2ast_arguments(PyObject* obj, arguments_ty* out, PyArena* arena);
static int obj2ast_arg(PyObject* obj, arg_ty* out, PyArena* arena);
static int obj2ast_keyword(PyObject* obj, keyword_ty* out, PyArena* arena);
static int obj2ast_alias(PyObject* obj, alias_ty* out, PyArena* arena);
static int obj2ast_withitem(PyObject* obj, withitem_ty* out, PyArena* arena);

mod_ty
Module(asdl_seq * body, PyArena *arena)
{
    mod_ty p;
    p = (mod_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Module_kind;
    p->v.Module.body = body;
    return p;
}

mod_ty
Interactive(asdl_seq * body, PyArena *arena)
{
    mod_ty p;
    p = (mod_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Interactive_kind;
    p->v.Interactive.body = body;
    return p;
}

mod_ty
Expression(expr_ty body, PyArena *arena)
{
    mod_ty p;
    if (!body) {
        PyErr_SetString(PyExc_ValueError,
                        "field body is required for Expression");
        return NULL;
    }
    p = (mod_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Expression_kind;
    p->v.Expression.body = body;
    return p;
}

mod_ty
Suite(asdl_seq * body, PyArena *arena)
{
    mod_ty p;
    p = (mod_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Suite_kind;
    p->v.Suite.body = body;
    return p;
}

stmt_ty
FunctionDef(identifier name, arguments_ty args, asdl_seq * body, asdl_seq *
            decorator_list, expr_ty returns, int lineno, int col_offset,
            PyArena *arena)
{
    stmt_ty p;
    if (!name) {
        PyErr_SetString(PyExc_ValueError,
                        "field name is required for FunctionDef");
        return NULL;
    }
    if (!args) {
        PyErr_SetString(PyExc_ValueError,
                        "field args is required for FunctionDef");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = FunctionDef_kind;
    p->v.FunctionDef.name = name;
    p->v.FunctionDef.args = args;
    p->v.FunctionDef.body = body;
    p->v.FunctionDef.decorator_list = decorator_list;
    p->v.FunctionDef.returns = returns;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
ClassDef(identifier name, asdl_seq * bases, asdl_seq * keywords, expr_ty
         starargs, expr_ty kwargs, asdl_seq * body, asdl_seq * decorator_list,
         int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    if (!name) {
        PyErr_SetString(PyExc_ValueError,
                        "field name is required for ClassDef");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = ClassDef_kind;
    p->v.ClassDef.name = name;
    p->v.ClassDef.bases = bases;
    p->v.ClassDef.keywords = keywords;
    p->v.ClassDef.starargs = starargs;
    p->v.ClassDef.kwargs = kwargs;
    p->v.ClassDef.body = body;
    p->v.ClassDef.decorator_list = decorator_list;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Return(expr_ty value, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Return_kind;
    p->v.Return.value = value;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Delete(asdl_seq * targets, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Delete_kind;
    p->v.Delete.targets = targets;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Assign(asdl_seq * targets, expr_ty value, int lineno, int col_offset, PyArena
       *arena)
{
    stmt_ty p;
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for Assign");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Assign_kind;
    p->v.Assign.targets = targets;
    p->v.Assign.value = value;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
AugAssign(expr_ty target, operator_ty op, expr_ty value, int lineno, int
          col_offset, PyArena *arena)
{
    stmt_ty p;
    if (!target) {
        PyErr_SetString(PyExc_ValueError,
                        "field target is required for AugAssign");
        return NULL;
    }
    if (!op) {
        PyErr_SetString(PyExc_ValueError,
                        "field op is required for AugAssign");
        return NULL;
    }
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for AugAssign");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = AugAssign_kind;
    p->v.AugAssign.target = target;
    p->v.AugAssign.op = op;
    p->v.AugAssign.value = value;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
For(expr_ty target, expr_ty iter, asdl_seq * body, asdl_seq * orelse, int
    lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    if (!target) {
        PyErr_SetString(PyExc_ValueError,
                        "field target is required for For");
        return NULL;
    }
    if (!iter) {
        PyErr_SetString(PyExc_ValueError,
                        "field iter is required for For");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = For_kind;
    p->v.For.target = target;
    p->v.For.iter = iter;
    p->v.For.body = body;
    p->v.For.orelse = orelse;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
While(expr_ty test, asdl_seq * body, asdl_seq * orelse, int lineno, int
      col_offset, PyArena *arena)
{
    stmt_ty p;
    if (!test) {
        PyErr_SetString(PyExc_ValueError,
                        "field test is required for While");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = While_kind;
    p->v.While.test = test;
    p->v.While.body = body;
    p->v.While.orelse = orelse;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
If(expr_ty test, asdl_seq * body, asdl_seq * orelse, int lineno, int
   col_offset, PyArena *arena)
{
    stmt_ty p;
    if (!test) {
        PyErr_SetString(PyExc_ValueError,
                        "field test is required for If");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = If_kind;
    p->v.If.test = test;
    p->v.If.body = body;
    p->v.If.orelse = orelse;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
With(asdl_seq * items, asdl_seq * body, int lineno, int col_offset, PyArena
     *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = With_kind;
    p->v.With.items = items;
    p->v.With.body = body;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Raise(expr_ty exc, expr_ty cause, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Raise_kind;
    p->v.Raise.exc = exc;
    p->v.Raise.cause = cause;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Try(asdl_seq * body, asdl_seq * handlers, asdl_seq * orelse, asdl_seq *
    finalbody, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Try_kind;
    p->v.Try.body = body;
    p->v.Try.handlers = handlers;
    p->v.Try.orelse = orelse;
    p->v.Try.finalbody = finalbody;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Assert(expr_ty test, expr_ty msg, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    if (!test) {
        PyErr_SetString(PyExc_ValueError,
                        "field test is required for Assert");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Assert_kind;
    p->v.Assert.test = test;
    p->v.Assert.msg = msg;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Import(asdl_seq * names, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Import_kind;
    p->v.Import.names = names;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
ImportFrom(identifier module, asdl_seq * names, int level, int lineno, int
           col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = ImportFrom_kind;
    p->v.ImportFrom.module = module;
    p->v.ImportFrom.names = names;
    p->v.ImportFrom.level = level;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Global(asdl_seq * names, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Global_kind;
    p->v.Global.names = names;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Nonlocal(asdl_seq * names, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Nonlocal_kind;
    p->v.Nonlocal.names = names;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Expr(expr_ty value, int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for Expr");
        return NULL;
    }
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Expr_kind;
    p->v.Expr.value = value;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Pass(int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Pass_kind;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Break(int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Break_kind;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

stmt_ty
Continue(int lineno, int col_offset, PyArena *arena)
{
    stmt_ty p;
    p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Continue_kind;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
BoolOp(boolop_ty op, asdl_seq * values, int lineno, int col_offset, PyArena
       *arena)
{
    expr_ty p;
    if (!op) {
        PyErr_SetString(PyExc_ValueError,
                        "field op is required for BoolOp");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = BoolOp_kind;
    p->v.BoolOp.op = op;
    p->v.BoolOp.values = values;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
BinOp(expr_ty left, operator_ty op, expr_ty right, int lineno, int col_offset,
      PyArena *arena)
{
    expr_ty p;
    if (!left) {
        PyErr_SetString(PyExc_ValueError,
                        "field left is required for BinOp");
        return NULL;
    }
    if (!op) {
        PyErr_SetString(PyExc_ValueError,
                        "field op is required for BinOp");
        return NULL;
    }
    if (!right) {
        PyErr_SetString(PyExc_ValueError,
                        "field right is required for BinOp");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = BinOp_kind;
    p->v.BinOp.left = left;
    p->v.BinOp.op = op;
    p->v.BinOp.right = right;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
UnaryOp(unaryop_ty op, expr_ty operand, int lineno, int col_offset, PyArena
        *arena)
{
    expr_ty p;
    if (!op) {
        PyErr_SetString(PyExc_ValueError,
                        "field op is required for UnaryOp");
        return NULL;
    }
    if (!operand) {
        PyErr_SetString(PyExc_ValueError,
                        "field operand is required for UnaryOp");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = UnaryOp_kind;
    p->v.UnaryOp.op = op;
    p->v.UnaryOp.operand = operand;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Lambda(arguments_ty args, expr_ty body, int lineno, int col_offset, PyArena
       *arena)
{
    expr_ty p;
    if (!args) {
        PyErr_SetString(PyExc_ValueError,
                        "field args is required for Lambda");
        return NULL;
    }
    if (!body) {
        PyErr_SetString(PyExc_ValueError,
                        "field body is required for Lambda");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Lambda_kind;
    p->v.Lambda.args = args;
    p->v.Lambda.body = body;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
IfExp(expr_ty test, expr_ty body, expr_ty orelse, int lineno, int col_offset,
      PyArena *arena)
{
    expr_ty p;
    if (!test) {
        PyErr_SetString(PyExc_ValueError,
                        "field test is required for IfExp");
        return NULL;
    }
    if (!body) {
        PyErr_SetString(PyExc_ValueError,
                        "field body is required for IfExp");
        return NULL;
    }
    if (!orelse) {
        PyErr_SetString(PyExc_ValueError,
                        "field orelse is required for IfExp");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = IfExp_kind;
    p->v.IfExp.test = test;
    p->v.IfExp.body = body;
    p->v.IfExp.orelse = orelse;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Dict(asdl_seq * keys, asdl_seq * values, int lineno, int col_offset, PyArena
     *arena)
{
    expr_ty p;
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Dict_kind;
    p->v.Dict.keys = keys;
    p->v.Dict.values = values;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Set(asdl_seq * elts, int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Set_kind;
    p->v.Set.elts = elts;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
ListComp(expr_ty elt, asdl_seq * generators, int lineno, int col_offset,
         PyArena *arena)
{
    expr_ty p;
    if (!elt) {
        PyErr_SetString(PyExc_ValueError,
                        "field elt is required for ListComp");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = ListComp_kind;
    p->v.ListComp.elt = elt;
    p->v.ListComp.generators = generators;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
SetComp(expr_ty elt, asdl_seq * generators, int lineno, int col_offset, PyArena
        *arena)
{
    expr_ty p;
    if (!elt) {
        PyErr_SetString(PyExc_ValueError,
                        "field elt is required for SetComp");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = SetComp_kind;
    p->v.SetComp.elt = elt;
    p->v.SetComp.generators = generators;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
DictComp(expr_ty key, expr_ty value, asdl_seq * generators, int lineno, int
         col_offset, PyArena *arena)
{
    expr_ty p;
    if (!key) {
        PyErr_SetString(PyExc_ValueError,
                        "field key is required for DictComp");
        return NULL;
    }
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for DictComp");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = DictComp_kind;
    p->v.DictComp.key = key;
    p->v.DictComp.value = value;
    p->v.DictComp.generators = generators;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
GeneratorExp(expr_ty elt, asdl_seq * generators, int lineno, int col_offset,
             PyArena *arena)
{
    expr_ty p;
    if (!elt) {
        PyErr_SetString(PyExc_ValueError,
                        "field elt is required for GeneratorExp");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = GeneratorExp_kind;
    p->v.GeneratorExp.elt = elt;
    p->v.GeneratorExp.generators = generators;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Yield(expr_ty value, int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Yield_kind;
    p->v.Yield.value = value;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
YieldFrom(expr_ty value, int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for YieldFrom");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = YieldFrom_kind;
    p->v.YieldFrom.value = value;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Compare(expr_ty left, asdl_int_seq * ops, asdl_seq * comparators, int lineno,
        int col_offset, PyArena *arena)
{
    expr_ty p;
    if (!left) {
        PyErr_SetString(PyExc_ValueError,
                        "field left is required for Compare");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Compare_kind;
    p->v.Compare.left = left;
    p->v.Compare.ops = ops;
    p->v.Compare.comparators = comparators;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Call(expr_ty func, asdl_seq * args, asdl_seq * keywords, expr_ty starargs,
     expr_ty kwargs, int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    if (!func) {
        PyErr_SetString(PyExc_ValueError,
                        "field func is required for Call");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Call_kind;
    p->v.Call.func = func;
    p->v.Call.args = args;
    p->v.Call.keywords = keywords;
    p->v.Call.starargs = starargs;
    p->v.Call.kwargs = kwargs;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Num(object n, int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    if (!n) {
        PyErr_SetString(PyExc_ValueError,
                        "field n is required for Num");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Num_kind;
    p->v.Num.n = n;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Str(string s, int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    if (!s) {
        PyErr_SetString(PyExc_ValueError,
                        "field s is required for Str");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Str_kind;
    p->v.Str.s = s;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Bytes(bytes s, int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    if (!s) {
        PyErr_SetString(PyExc_ValueError,
                        "field s is required for Bytes");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Bytes_kind;
    p->v.Bytes.s = s;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
NameConstant(singleton value, int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for NameConstant");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = NameConstant_kind;
    p->v.NameConstant.value = value;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Ellipsis(int lineno, int col_offset, PyArena *arena)
{
    expr_ty p;
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Ellipsis_kind;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Attribute(expr_ty value, identifier attr, expr_context_ty ctx, int lineno, int
          col_offset, PyArena *arena)
{
    expr_ty p;
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for Attribute");
        return NULL;
    }
    if (!attr) {
        PyErr_SetString(PyExc_ValueError,
                        "field attr is required for Attribute");
        return NULL;
    }
    if (!ctx) {
        PyErr_SetString(PyExc_ValueError,
                        "field ctx is required for Attribute");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Attribute_kind;
    p->v.Attribute.value = value;
    p->v.Attribute.attr = attr;
    p->v.Attribute.ctx = ctx;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Subscript(expr_ty value, slice_ty slice, expr_context_ty ctx, int lineno, int
          col_offset, PyArena *arena)
{
    expr_ty p;
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for Subscript");
        return NULL;
    }
    if (!slice) {
        PyErr_SetString(PyExc_ValueError,
                        "field slice is required for Subscript");
        return NULL;
    }
    if (!ctx) {
        PyErr_SetString(PyExc_ValueError,
                        "field ctx is required for Subscript");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Subscript_kind;
    p->v.Subscript.value = value;
    p->v.Subscript.slice = slice;
    p->v.Subscript.ctx = ctx;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Starred(expr_ty value, expr_context_ty ctx, int lineno, int col_offset, PyArena
        *arena)
{
    expr_ty p;
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for Starred");
        return NULL;
    }
    if (!ctx) {
        PyErr_SetString(PyExc_ValueError,
                        "field ctx is required for Starred");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Starred_kind;
    p->v.Starred.value = value;
    p->v.Starred.ctx = ctx;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Name(identifier id, expr_context_ty ctx, int lineno, int col_offset, PyArena
     *arena)
{
    expr_ty p;
    if (!id) {
        PyErr_SetString(PyExc_ValueError,
                        "field id is required for Name");
        return NULL;
    }
    if (!ctx) {
        PyErr_SetString(PyExc_ValueError,
                        "field ctx is required for Name");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Name_kind;
    p->v.Name.id = id;
    p->v.Name.ctx = ctx;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
List(asdl_seq * elts, expr_context_ty ctx, int lineno, int col_offset, PyArena
     *arena)
{
    expr_ty p;
    if (!ctx) {
        PyErr_SetString(PyExc_ValueError,
                        "field ctx is required for List");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = List_kind;
    p->v.List.elts = elts;
    p->v.List.ctx = ctx;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

expr_ty
Tuple(asdl_seq * elts, expr_context_ty ctx, int lineno, int col_offset, PyArena
      *arena)
{
    expr_ty p;
    if (!ctx) {
        PyErr_SetString(PyExc_ValueError,
                        "field ctx is required for Tuple");
        return NULL;
    }
    p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Tuple_kind;
    p->v.Tuple.elts = elts;
    p->v.Tuple.ctx = ctx;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

slice_ty
Slice(expr_ty lower, expr_ty upper, expr_ty step, PyArena *arena)
{
    slice_ty p;
    p = (slice_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Slice_kind;
    p->v.Slice.lower = lower;
    p->v.Slice.upper = upper;
    p->v.Slice.step = step;
    return p;
}

slice_ty
ExtSlice(asdl_seq * dims, PyArena *arena)
{
    slice_ty p;
    p = (slice_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = ExtSlice_kind;
    p->v.ExtSlice.dims = dims;
    return p;
}

slice_ty
Index(expr_ty value, PyArena *arena)
{
    slice_ty p;
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for Index");
        return NULL;
    }
    p = (slice_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = Index_kind;
    p->v.Index.value = value;
    return p;
}

comprehension_ty
comprehension(expr_ty target, expr_ty iter, asdl_seq * ifs, PyArena *arena)
{
    comprehension_ty p;
    if (!target) {
        PyErr_SetString(PyExc_ValueError,
                        "field target is required for comprehension");
        return NULL;
    }
    if (!iter) {
        PyErr_SetString(PyExc_ValueError,
                        "field iter is required for comprehension");
        return NULL;
    }
    p = (comprehension_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->target = target;
    p->iter = iter;
    p->ifs = ifs;
    return p;
}

excepthandler_ty
ExceptHandler(expr_ty type, identifier name, asdl_seq * body, int lineno, int
              col_offset, PyArena *arena)
{
    excepthandler_ty p;
    p = (excepthandler_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->kind = ExceptHandler_kind;
    p->v.ExceptHandler.type = type;
    p->v.ExceptHandler.name = name;
    p->v.ExceptHandler.body = body;
    p->lineno = lineno;
    p->col_offset = col_offset;
    return p;
}

arguments_ty
arguments(asdl_seq * args, arg_ty vararg, asdl_seq * kwonlyargs, asdl_seq *
          kw_defaults, arg_ty kwarg, asdl_seq * defaults, PyArena *arena)
{
    arguments_ty p;
    p = (arguments_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->args = args;
    p->vararg = vararg;
    p->kwonlyargs = kwonlyargs;
    p->kw_defaults = kw_defaults;
    p->kwarg = kwarg;
    p->defaults = defaults;
    return p;
}

arg_ty
arg(identifier arg, expr_ty annotation, PyArena *arena)
{
    arg_ty p;
    if (!arg) {
        PyErr_SetString(PyExc_ValueError,
                        "field arg is required for arg");
        return NULL;
    }
    p = (arg_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->arg = arg;
    p->annotation = annotation;
    return p;
}

keyword_ty
keyword(identifier arg, expr_ty value, PyArena *arena)
{
    keyword_ty p;
    if (!arg) {
        PyErr_SetString(PyExc_ValueError,
                        "field arg is required for keyword");
        return NULL;
    }
    if (!value) {
        PyErr_SetString(PyExc_ValueError,
                        "field value is required for keyword");
        return NULL;
    }
    p = (keyword_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->arg = arg;
    p->value = value;
    return p;
}

alias_ty
alias(identifier name, identifier asname, PyArena *arena)
{
    alias_ty p;
    if (!name) {
        PyErr_SetString(PyExc_ValueError,
                        "field name is required for alias");
        return NULL;
    }
    p = (alias_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->name = name;
    p->asname = asname;
    return p;
}

withitem_ty
withitem(expr_ty context_expr, expr_ty optional_vars, PyArena *arena)
{
    withitem_ty p;
    if (!context_expr) {
        PyErr_SetString(PyExc_ValueError,
                        "field context_expr is required for withitem");
        return NULL;
    }
    p = (withitem_ty)PyArena_Malloc(arena, sizeof(*p));
    if (!p)
        return NULL;
    p->context_expr = context_expr;
    p->optional_vars = optional_vars;
    return p;
}


PyObject*
ast2obj_mod(void* _o)
{
    mod_ty o = (mod_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    switch (o->kind) {
    case Module_kind:
        result = PyType_GenericNew(Module_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Module.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Interactive_kind:
        result = PyType_GenericNew(Interactive_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Interactive.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Expression_kind:
        result = PyType_GenericNew(Expression_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Expression.body);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Suite_kind:
        result = PyType_GenericNew(Suite_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Suite.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    }
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject*
ast2obj_stmt(void* _o)
{
    stmt_ty o = (stmt_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    switch (o->kind) {
    case FunctionDef_kind:
        result = PyType_GenericNew(FunctionDef_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_identifier(o->v.FunctionDef.name);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_name, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_arguments(o->v.FunctionDef.args);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_args, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.FunctionDef.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.FunctionDef.decorator_list, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_decorator_list, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.FunctionDef.returns);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_returns, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case ClassDef_kind:
        result = PyType_GenericNew(ClassDef_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_identifier(o->v.ClassDef.name);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_name, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.ClassDef.bases, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_bases, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.ClassDef.keywords, ast2obj_keyword);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_keywords, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.ClassDef.starargs);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_starargs, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.ClassDef.kwargs);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_kwargs, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.ClassDef.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.ClassDef.decorator_list, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_decorator_list, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Return_kind:
        result = PyType_GenericNew(Return_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Return.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Delete_kind:
        result = PyType_GenericNew(Delete_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Delete.targets, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_targets, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Assign_kind:
        result = PyType_GenericNew(Assign_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Assign.targets, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_targets, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.Assign.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case AugAssign_kind:
        result = PyType_GenericNew(AugAssign_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.AugAssign.target);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_target, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_operator(o->v.AugAssign.op);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_op, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.AugAssign.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case For_kind:
        result = PyType_GenericNew(For_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.For.target);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_target, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.For.iter);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_iter, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.For.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.For.orelse, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_orelse, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case While_kind:
        result = PyType_GenericNew(While_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.While.test);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_test, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.While.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.While.orelse, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_orelse, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case If_kind:
        result = PyType_GenericNew(If_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.If.test);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_test, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.If.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.If.orelse, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_orelse, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case With_kind:
        result = PyType_GenericNew(With_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.With.items, ast2obj_withitem);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_items, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.With.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Raise_kind:
        result = PyType_GenericNew(Raise_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Raise.exc);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_exc, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.Raise.cause);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_cause, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Try_kind:
        result = PyType_GenericNew(Try_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Try.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.Try.handlers, ast2obj_excepthandler);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_handlers, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.Try.orelse, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_orelse, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.Try.finalbody, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_finalbody, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Assert_kind:
        result = PyType_GenericNew(Assert_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Assert.test);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_test, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.Assert.msg);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_msg, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Import_kind:
        result = PyType_GenericNew(Import_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Import.names, ast2obj_alias);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_names, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case ImportFrom_kind:
        result = PyType_GenericNew(ImportFrom_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_identifier(o->v.ImportFrom.module);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_module, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.ImportFrom.names, ast2obj_alias);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_names, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_int(o->v.ImportFrom.level);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_level, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Global_kind:
        result = PyType_GenericNew(Global_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Global.names, ast2obj_identifier);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_names, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Nonlocal_kind:
        result = PyType_GenericNew(Nonlocal_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Nonlocal.names, ast2obj_identifier);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_names, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Expr_kind:
        result = PyType_GenericNew(Expr_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Expr.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Pass_kind:
        result = PyType_GenericNew(Pass_type, NULL, NULL);
        if (!result) goto failed;
        break;
    case Break_kind:
        result = PyType_GenericNew(Break_type, NULL, NULL);
        if (!result) goto failed;
        break;
    case Continue_kind:
        result = PyType_GenericNew(Continue_type, NULL, NULL);
        if (!result) goto failed;
        break;
    }
    value = ast2obj_int(o->lineno);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_lineno, value) < 0)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_int(o->col_offset);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_col_offset, value) < 0)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject*
ast2obj_expr(void* _o)
{
    expr_ty o = (expr_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    switch (o->kind) {
    case BoolOp_kind:
        result = PyType_GenericNew(BoolOp_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_boolop(o->v.BoolOp.op);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_op, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.BoolOp.values, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_values, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case BinOp_kind:
        result = PyType_GenericNew(BinOp_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.BinOp.left);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_left, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_operator(o->v.BinOp.op);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_op, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.BinOp.right);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_right, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case UnaryOp_kind:
        result = PyType_GenericNew(UnaryOp_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_unaryop(o->v.UnaryOp.op);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_op, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.UnaryOp.operand);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_operand, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Lambda_kind:
        result = PyType_GenericNew(Lambda_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_arguments(o->v.Lambda.args);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_args, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.Lambda.body);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case IfExp_kind:
        result = PyType_GenericNew(IfExp_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.IfExp.test);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_test, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.IfExp.body);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.IfExp.orelse);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_orelse, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Dict_kind:
        result = PyType_GenericNew(Dict_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Dict.keys, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_keys, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.Dict.values, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_values, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Set_kind:
        result = PyType_GenericNew(Set_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Set.elts, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_elts, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case ListComp_kind:
        result = PyType_GenericNew(ListComp_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.ListComp.elt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_elt, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.ListComp.generators, ast2obj_comprehension);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_generators, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case SetComp_kind:
        result = PyType_GenericNew(SetComp_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.SetComp.elt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_elt, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.SetComp.generators, ast2obj_comprehension);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_generators, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case DictComp_kind:
        result = PyType_GenericNew(DictComp_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.DictComp.key);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_key, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.DictComp.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.DictComp.generators, ast2obj_comprehension);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_generators, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case GeneratorExp_kind:
        result = PyType_GenericNew(GeneratorExp_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.GeneratorExp.elt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_elt, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.GeneratorExp.generators,
                             ast2obj_comprehension);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_generators, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Yield_kind:
        result = PyType_GenericNew(Yield_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Yield.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case YieldFrom_kind:
        result = PyType_GenericNew(YieldFrom_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.YieldFrom.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Compare_kind:
        result = PyType_GenericNew(Compare_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Compare.left);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_left, value) == -1)
            goto failed;
        Py_DECREF(value);
        {
            Py_ssize_t i, n = asdl_seq_LEN(o->v.Compare.ops);
            value = PyList_New(n);
            if (!value) goto failed;
            for(i = 0; i < n; i++)
                PyList_SET_ITEM(value, i, ast2obj_cmpop((cmpop_ty)asdl_seq_GET(o->v.Compare.ops, i)));
        }
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_ops, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.Compare.comparators, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_comparators, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Call_kind:
        result = PyType_GenericNew(Call_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Call.func);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_func, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.Call.args, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_args, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.Call.keywords, ast2obj_keyword);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_keywords, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.Call.starargs);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_starargs, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.Call.kwargs);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_kwargs, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Num_kind:
        result = PyType_GenericNew(Num_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_object(o->v.Num.n);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_n, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Str_kind:
        result = PyType_GenericNew(Str_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_string(o->v.Str.s);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_s, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Bytes_kind:
        result = PyType_GenericNew(Bytes_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_bytes(o->v.Bytes.s);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_s, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case NameConstant_kind:
        result = PyType_GenericNew(NameConstant_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_singleton(o->v.NameConstant.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Ellipsis_kind:
        result = PyType_GenericNew(Ellipsis_type, NULL, NULL);
        if (!result) goto failed;
        break;
    case Attribute_kind:
        result = PyType_GenericNew(Attribute_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Attribute.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_identifier(o->v.Attribute.attr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_attr, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr_context(o->v.Attribute.ctx);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_ctx, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Subscript_kind:
        result = PyType_GenericNew(Subscript_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Subscript.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_slice(o->v.Subscript.slice);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_slice, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr_context(o->v.Subscript.ctx);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_ctx, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Starred_kind:
        result = PyType_GenericNew(Starred_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Starred.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr_context(o->v.Starred.ctx);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_ctx, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Name_kind:
        result = PyType_GenericNew(Name_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_identifier(o->v.Name.id);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_id, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr_context(o->v.Name.ctx);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_ctx, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case List_kind:
        result = PyType_GenericNew(List_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.List.elts, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_elts, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr_context(o->v.List.ctx);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_ctx, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Tuple_kind:
        result = PyType_GenericNew(Tuple_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.Tuple.elts, ast2obj_expr);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_elts, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr_context(o->v.Tuple.ctx);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_ctx, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    }
    value = ast2obj_int(o->lineno);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_lineno, value) < 0)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_int(o->col_offset);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_col_offset, value) < 0)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject* ast2obj_expr_context(expr_context_ty o)
{
    switch(o) {
        case Load:
            Py_INCREF(Load_singleton);
            return Load_singleton;
        case Store:
            Py_INCREF(Store_singleton);
            return Store_singleton;
        case Del:
            Py_INCREF(Del_singleton);
            return Del_singleton;
        case AugLoad:
            Py_INCREF(AugLoad_singleton);
            return AugLoad_singleton;
        case AugStore:
            Py_INCREF(AugStore_singleton);
            return AugStore_singleton;
        case Param:
            Py_INCREF(Param_singleton);
            return Param_singleton;
        default:
            /* should never happen, but just in case ... */
            PyErr_Format(PyExc_SystemError, "unknown expr_context found");
            return NULL;
    }
}
PyObject*
ast2obj_slice(void* _o)
{
    slice_ty o = (slice_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    switch (o->kind) {
    case Slice_kind:
        result = PyType_GenericNew(Slice_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Slice.lower);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_lower, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.Slice.upper);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_upper, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_expr(o->v.Slice.step);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_step, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case ExtSlice_kind:
        result = PyType_GenericNew(ExtSlice_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_list(o->v.ExtSlice.dims, ast2obj_slice);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_dims, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    case Index_kind:
        result = PyType_GenericNew(Index_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.Index.value);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    }
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject* ast2obj_boolop(boolop_ty o)
{
    switch(o) {
        case And:
            Py_INCREF(And_singleton);
            return And_singleton;
        case Or:
            Py_INCREF(Or_singleton);
            return Or_singleton;
        default:
            /* should never happen, but just in case ... */
            PyErr_Format(PyExc_SystemError, "unknown boolop found");
            return NULL;
    }
}
PyObject* ast2obj_operator(operator_ty o)
{
    switch(o) {
        case Add:
            Py_INCREF(Add_singleton);
            return Add_singleton;
        case Sub:
            Py_INCREF(Sub_singleton);
            return Sub_singleton;
        case Mult:
            Py_INCREF(Mult_singleton);
            return Mult_singleton;
        case Div:
            Py_INCREF(Div_singleton);
            return Div_singleton;
        case Mod:
            Py_INCREF(Mod_singleton);
            return Mod_singleton;
        case Pow:
            Py_INCREF(Pow_singleton);
            return Pow_singleton;
        case LShift:
            Py_INCREF(LShift_singleton);
            return LShift_singleton;
        case RShift:
            Py_INCREF(RShift_singleton);
            return RShift_singleton;
        case BitOr:
            Py_INCREF(BitOr_singleton);
            return BitOr_singleton;
        case BitXor:
            Py_INCREF(BitXor_singleton);
            return BitXor_singleton;
        case BitAnd:
            Py_INCREF(BitAnd_singleton);
            return BitAnd_singleton;
        case FloorDiv:
            Py_INCREF(FloorDiv_singleton);
            return FloorDiv_singleton;
        default:
            /* should never happen, but just in case ... */
            PyErr_Format(PyExc_SystemError, "unknown operator found");
            return NULL;
    }
}
PyObject* ast2obj_unaryop(unaryop_ty o)
{
    switch(o) {
        case Invert:
            Py_INCREF(Invert_singleton);
            return Invert_singleton;
        case Not:
            Py_INCREF(Not_singleton);
            return Not_singleton;
        case UAdd:
            Py_INCREF(UAdd_singleton);
            return UAdd_singleton;
        case USub:
            Py_INCREF(USub_singleton);
            return USub_singleton;
        default:
            /* should never happen, but just in case ... */
            PyErr_Format(PyExc_SystemError, "unknown unaryop found");
            return NULL;
    }
}
PyObject* ast2obj_cmpop(cmpop_ty o)
{
    switch(o) {
        case Eq:
            Py_INCREF(Eq_singleton);
            return Eq_singleton;
        case NotEq:
            Py_INCREF(NotEq_singleton);
            return NotEq_singleton;
        case Lt:
            Py_INCREF(Lt_singleton);
            return Lt_singleton;
        case LtE:
            Py_INCREF(LtE_singleton);
            return LtE_singleton;
        case Gt:
            Py_INCREF(Gt_singleton);
            return Gt_singleton;
        case GtE:
            Py_INCREF(GtE_singleton);
            return GtE_singleton;
        case Is:
            Py_INCREF(Is_singleton);
            return Is_singleton;
        case IsNot:
            Py_INCREF(IsNot_singleton);
            return IsNot_singleton;
        case In:
            Py_INCREF(In_singleton);
            return In_singleton;
        case NotIn:
            Py_INCREF(NotIn_singleton);
            return NotIn_singleton;
        default:
            /* should never happen, but just in case ... */
            PyErr_Format(PyExc_SystemError, "unknown cmpop found");
            return NULL;
    }
}
PyObject*
ast2obj_comprehension(void* _o)
{
    comprehension_ty o = (comprehension_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    result = PyType_GenericNew(comprehension_type, NULL, NULL);
    if (!result) return NULL;
    value = ast2obj_expr(o->target);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_target, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_expr(o->iter);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_iter, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_list(o->ifs, ast2obj_expr);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_ifs, value) == -1)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject*
ast2obj_excepthandler(void* _o)
{
    excepthandler_ty o = (excepthandler_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    switch (o->kind) {
    case ExceptHandler_kind:
        result = PyType_GenericNew(ExceptHandler_type, NULL, NULL);
        if (!result) goto failed;
        value = ast2obj_expr(o->v.ExceptHandler.type);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_type, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_identifier(o->v.ExceptHandler.name);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_name, value) == -1)
            goto failed;
        Py_DECREF(value);
        value = ast2obj_list(o->v.ExceptHandler.body, ast2obj_stmt);
        if (!value) goto failed;
        if (_PyObject_SetAttrId(result, &PyId_body, value) == -1)
            goto failed;
        Py_DECREF(value);
        break;
    }
    value = ast2obj_int(o->lineno);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_lineno, value) < 0)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_int(o->col_offset);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_col_offset, value) < 0)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject*
ast2obj_arguments(void* _o)
{
    arguments_ty o = (arguments_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    result = PyType_GenericNew(arguments_type, NULL, NULL);
    if (!result) return NULL;
    value = ast2obj_list(o->args, ast2obj_arg);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_args, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_arg(o->vararg);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_vararg, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_list(o->kwonlyargs, ast2obj_arg);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_kwonlyargs, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_list(o->kw_defaults, ast2obj_expr);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_kw_defaults, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_arg(o->kwarg);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_kwarg, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_list(o->defaults, ast2obj_expr);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_defaults, value) == -1)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject*
ast2obj_arg(void* _o)
{
    arg_ty o = (arg_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    result = PyType_GenericNew(arg_type, NULL, NULL);
    if (!result) return NULL;
    value = ast2obj_identifier(o->arg);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_arg, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_expr(o->annotation);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_annotation, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_int(o->lineno);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_lineno, value) < 0)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_int(o->col_offset);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_col_offset, value) < 0)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject*
ast2obj_keyword(void* _o)
{
    keyword_ty o = (keyword_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    result = PyType_GenericNew(keyword_type, NULL, NULL);
    if (!result) return NULL;
    value = ast2obj_identifier(o->arg);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_arg, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_expr(o->value);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject*
ast2obj_alias(void* _o)
{
    alias_ty o = (alias_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    result = PyType_GenericNew(alias_type, NULL, NULL);
    if (!result) return NULL;
    value = ast2obj_identifier(o->name);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_name, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_identifier(o->asname);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_asname, value) == -1)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}

PyObject*
ast2obj_withitem(void* _o)
{
    withitem_ty o = (withitem_ty)_o;
    PyObject *result = NULL, *value = NULL;
    if (!o) {
        Py_INCREF(Py_None);
        return Py_None;
    }

    result = PyType_GenericNew(withitem_type, NULL, NULL);
    if (!result) return NULL;
    value = ast2obj_expr(o->context_expr);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_context_expr, value) == -1)
        goto failed;
    Py_DECREF(value);
    value = ast2obj_expr(o->optional_vars);
    if (!value) goto failed;
    if (_PyObject_SetAttrId(result, &PyId_optional_vars, value) == -1)
        goto failed;
    Py_DECREF(value);
    return result;
failed:
    Py_XDECREF(value);
    Py_XDECREF(result);
    return NULL;
}


int
obj2ast_mod(PyObject* obj, mod_ty* out, PyArena* arena)
{
    int isinstance;

    PyObject *tmp = NULL;

    if (obj == Py_None) {
        *out = NULL;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Module_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* body;

        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Module field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from Module");
            return 1;
        }
        *out = Module(body, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Interactive_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* body;

        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Interactive field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from Interactive");
            return 1;
        }
        *out = Interactive(body, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Expression_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty body;

        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &body, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from Expression");
            return 1;
        }
        *out = Expression(body, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Suite_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* body;

        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Suite field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from Suite");
            return 1;
        }
        *out = Suite(body, arena);
        if (*out == NULL) goto failed;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of mod, but got %R", obj);
    failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_stmt(PyObject* obj, stmt_ty* out, PyArena* arena)
{
    int isinstance;

    PyObject *tmp = NULL;
    int lineno;
    int col_offset;

    if (obj == Py_None) {
        *out = NULL;
        return 0;
    }
    if (_PyObject_HasAttrId(obj, &PyId_lineno)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_lineno);
        if (tmp == NULL) goto failed;
        res = obj2ast_int(tmp, &lineno, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"lineno\" missing from stmt");
        return 1;
    }
    if (_PyObject_HasAttrId(obj, &PyId_col_offset)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_col_offset);
        if (tmp == NULL) goto failed;
        res = obj2ast_int(tmp, &col_offset, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"col_offset\" missing from stmt");
        return 1;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)FunctionDef_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        identifier name;
        arguments_ty args;
        asdl_seq* body;
        asdl_seq* decorator_list;
        expr_ty returns;

        if (_PyObject_HasAttrId(obj, &PyId_name)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_name);
            if (tmp == NULL) goto failed;
            res = obj2ast_identifier(tmp, &name, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"name\" missing from FunctionDef");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_args)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_args);
            if (tmp == NULL) goto failed;
            res = obj2ast_arguments(tmp, &args, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"args\" missing from FunctionDef");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "FunctionDef field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from FunctionDef");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_decorator_list)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_decorator_list);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "FunctionDef field \"decorator_list\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            decorator_list = _Py_asdl_seq_new(len, arena);
            if (decorator_list == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(decorator_list, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"decorator_list\" missing from FunctionDef");
            return 1;
        }
        if (exists_not_none(obj, &PyId_returns)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_returns);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &returns, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            returns = NULL;
        }
        *out = FunctionDef(name, args, body, decorator_list, returns, lineno,
                           col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)ClassDef_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        identifier name;
        asdl_seq* bases;
        asdl_seq* keywords;
        expr_ty starargs;
        expr_ty kwargs;
        asdl_seq* body;
        asdl_seq* decorator_list;

        if (_PyObject_HasAttrId(obj, &PyId_name)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_name);
            if (tmp == NULL) goto failed;
            res = obj2ast_identifier(tmp, &name, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"name\" missing from ClassDef");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_bases)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_bases);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "ClassDef field \"bases\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            bases = _Py_asdl_seq_new(len, arena);
            if (bases == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(bases, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"bases\" missing from ClassDef");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_keywords)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_keywords);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "ClassDef field \"keywords\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            keywords = _Py_asdl_seq_new(len, arena);
            if (keywords == NULL) goto failed;
            for (i = 0; i < len; i++) {
                keyword_ty value;
                res = obj2ast_keyword(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(keywords, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"keywords\" missing from ClassDef");
            return 1;
        }
        if (exists_not_none(obj, &PyId_starargs)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_starargs);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &starargs, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            starargs = NULL;
        }
        if (exists_not_none(obj, &PyId_kwargs)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_kwargs);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &kwargs, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            kwargs = NULL;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "ClassDef field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from ClassDef");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_decorator_list)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_decorator_list);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "ClassDef field \"decorator_list\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            decorator_list = _Py_asdl_seq_new(len, arena);
            if (decorator_list == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(decorator_list, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"decorator_list\" missing from ClassDef");
            return 1;
        }
        *out = ClassDef(name, bases, keywords, starargs, kwargs, body,
                        decorator_list, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Return_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty value;

        if (exists_not_none(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            value = NULL;
        }
        *out = Return(value, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Delete_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* targets;

        if (_PyObject_HasAttrId(obj, &PyId_targets)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_targets);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Delete field \"targets\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            targets = _Py_asdl_seq_new(len, arena);
            if (targets == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(targets, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"targets\" missing from Delete");
            return 1;
        }
        *out = Delete(targets, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Assign_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* targets;
        expr_ty value;

        if (_PyObject_HasAttrId(obj, &PyId_targets)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_targets);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Assign field \"targets\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            targets = _Py_asdl_seq_new(len, arena);
            if (targets == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(targets, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"targets\" missing from Assign");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from Assign");
            return 1;
        }
        *out = Assign(targets, value, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)AugAssign_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty target;
        operator_ty op;
        expr_ty value;

        if (_PyObject_HasAttrId(obj, &PyId_target)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_target);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &target, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"target\" missing from AugAssign");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_op)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_op);
            if (tmp == NULL) goto failed;
            res = obj2ast_operator(tmp, &op, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"op\" missing from AugAssign");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from AugAssign");
            return 1;
        }
        *out = AugAssign(target, op, value, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)For_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty target;
        expr_ty iter;
        asdl_seq* body;
        asdl_seq* orelse;

        if (_PyObject_HasAttrId(obj, &PyId_target)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_target);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &target, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"target\" missing from For");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_iter)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_iter);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &iter, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"iter\" missing from For");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "For field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from For");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_orelse)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_orelse);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "For field \"orelse\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            orelse = _Py_asdl_seq_new(len, arena);
            if (orelse == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(orelse, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"orelse\" missing from For");
            return 1;
        }
        *out = For(target, iter, body, orelse, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)While_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty test;
        asdl_seq* body;
        asdl_seq* orelse;

        if (_PyObject_HasAttrId(obj, &PyId_test)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_test);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &test, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"test\" missing from While");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "While field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from While");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_orelse)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_orelse);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "While field \"orelse\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            orelse = _Py_asdl_seq_new(len, arena);
            if (orelse == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(orelse, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"orelse\" missing from While");
            return 1;
        }
        *out = While(test, body, orelse, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)If_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty test;
        asdl_seq* body;
        asdl_seq* orelse;

        if (_PyObject_HasAttrId(obj, &PyId_test)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_test);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &test, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"test\" missing from If");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "If field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from If");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_orelse)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_orelse);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "If field \"orelse\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            orelse = _Py_asdl_seq_new(len, arena);
            if (orelse == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(orelse, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"orelse\" missing from If");
            return 1;
        }
        *out = If(test, body, orelse, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)With_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* items;
        asdl_seq* body;

        if (_PyObject_HasAttrId(obj, &PyId_items)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_items);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "With field \"items\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            items = _Py_asdl_seq_new(len, arena);
            if (items == NULL) goto failed;
            for (i = 0; i < len; i++) {
                withitem_ty value;
                res = obj2ast_withitem(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(items, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"items\" missing from With");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "With field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from With");
            return 1;
        }
        *out = With(items, body, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Raise_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty exc;
        expr_ty cause;

        if (exists_not_none(obj, &PyId_exc)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_exc);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &exc, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            exc = NULL;
        }
        if (exists_not_none(obj, &PyId_cause)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_cause);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &cause, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            cause = NULL;
        }
        *out = Raise(exc, cause, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Try_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* body;
        asdl_seq* handlers;
        asdl_seq* orelse;
        asdl_seq* finalbody;

        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Try field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from Try");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_handlers)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_handlers);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Try field \"handlers\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            handlers = _Py_asdl_seq_new(len, arena);
            if (handlers == NULL) goto failed;
            for (i = 0; i < len; i++) {
                excepthandler_ty value;
                res = obj2ast_excepthandler(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(handlers, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"handlers\" missing from Try");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_orelse)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_orelse);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Try field \"orelse\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            orelse = _Py_asdl_seq_new(len, arena);
            if (orelse == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(orelse, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"orelse\" missing from Try");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_finalbody)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_finalbody);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Try field \"finalbody\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            finalbody = _Py_asdl_seq_new(len, arena);
            if (finalbody == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(finalbody, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"finalbody\" missing from Try");
            return 1;
        }
        *out = Try(body, handlers, orelse, finalbody, lineno, col_offset,
                   arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Assert_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty test;
        expr_ty msg;

        if (_PyObject_HasAttrId(obj, &PyId_test)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_test);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &test, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"test\" missing from Assert");
            return 1;
        }
        if (exists_not_none(obj, &PyId_msg)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_msg);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &msg, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            msg = NULL;
        }
        *out = Assert(test, msg, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Import_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* names;

        if (_PyObject_HasAttrId(obj, &PyId_names)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_names);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Import field \"names\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            names = _Py_asdl_seq_new(len, arena);
            if (names == NULL) goto failed;
            for (i = 0; i < len; i++) {
                alias_ty value;
                res = obj2ast_alias(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(names, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"names\" missing from Import");
            return 1;
        }
        *out = Import(names, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)ImportFrom_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        identifier module;
        asdl_seq* names;
        int level;

        if (exists_not_none(obj, &PyId_module)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_module);
            if (tmp == NULL) goto failed;
            res = obj2ast_identifier(tmp, &module, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            module = NULL;
        }
        if (_PyObject_HasAttrId(obj, &PyId_names)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_names);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "ImportFrom field \"names\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            names = _Py_asdl_seq_new(len, arena);
            if (names == NULL) goto failed;
            for (i = 0; i < len; i++) {
                alias_ty value;
                res = obj2ast_alias(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(names, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"names\" missing from ImportFrom");
            return 1;
        }
        if (exists_not_none(obj, &PyId_level)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_level);
            if (tmp == NULL) goto failed;
            res = obj2ast_int(tmp, &level, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            level = 0;
        }
        *out = ImportFrom(module, names, level, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Global_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* names;

        if (_PyObject_HasAttrId(obj, &PyId_names)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_names);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Global field \"names\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            names = _Py_asdl_seq_new(len, arena);
            if (names == NULL) goto failed;
            for (i = 0; i < len; i++) {
                identifier value;
                res = obj2ast_identifier(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(names, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"names\" missing from Global");
            return 1;
        }
        *out = Global(names, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Nonlocal_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* names;

        if (_PyObject_HasAttrId(obj, &PyId_names)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_names);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Nonlocal field \"names\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            names = _Py_asdl_seq_new(len, arena);
            if (names == NULL) goto failed;
            for (i = 0; i < len; i++) {
                identifier value;
                res = obj2ast_identifier(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(names, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"names\" missing from Nonlocal");
            return 1;
        }
        *out = Nonlocal(names, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Expr_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty value;

        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from Expr");
            return 1;
        }
        *out = Expr(value, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Pass_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {

        *out = Pass(lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Break_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {

        *out = Break(lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Continue_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {

        *out = Continue(lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of stmt, but got %R", obj);
    failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_expr(PyObject* obj, expr_ty* out, PyArena* arena)
{
    int isinstance;

    PyObject *tmp = NULL;
    int lineno;
    int col_offset;

    if (obj == Py_None) {
        *out = NULL;
        return 0;
    }
    if (_PyObject_HasAttrId(obj, &PyId_lineno)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_lineno);
        if (tmp == NULL) goto failed;
        res = obj2ast_int(tmp, &lineno, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"lineno\" missing from expr");
        return 1;
    }
    if (_PyObject_HasAttrId(obj, &PyId_col_offset)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_col_offset);
        if (tmp == NULL) goto failed;
        res = obj2ast_int(tmp, &col_offset, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"col_offset\" missing from expr");
        return 1;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)BoolOp_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        boolop_ty op;
        asdl_seq* values;

        if (_PyObject_HasAttrId(obj, &PyId_op)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_op);
            if (tmp == NULL) goto failed;
            res = obj2ast_boolop(tmp, &op, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"op\" missing from BoolOp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_values)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_values);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "BoolOp field \"values\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            values = _Py_asdl_seq_new(len, arena);
            if (values == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(values, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"values\" missing from BoolOp");
            return 1;
        }
        *out = BoolOp(op, values, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)BinOp_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty left;
        operator_ty op;
        expr_ty right;

        if (_PyObject_HasAttrId(obj, &PyId_left)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_left);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &left, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"left\" missing from BinOp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_op)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_op);
            if (tmp == NULL) goto failed;
            res = obj2ast_operator(tmp, &op, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"op\" missing from BinOp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_right)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_right);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &right, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"right\" missing from BinOp");
            return 1;
        }
        *out = BinOp(left, op, right, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)UnaryOp_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        unaryop_ty op;
        expr_ty operand;

        if (_PyObject_HasAttrId(obj, &PyId_op)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_op);
            if (tmp == NULL) goto failed;
            res = obj2ast_unaryop(tmp, &op, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"op\" missing from UnaryOp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_operand)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_operand);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &operand, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"operand\" missing from UnaryOp");
            return 1;
        }
        *out = UnaryOp(op, operand, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Lambda_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        arguments_ty args;
        expr_ty body;

        if (_PyObject_HasAttrId(obj, &PyId_args)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_args);
            if (tmp == NULL) goto failed;
            res = obj2ast_arguments(tmp, &args, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"args\" missing from Lambda");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &body, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from Lambda");
            return 1;
        }
        *out = Lambda(args, body, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)IfExp_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty test;
        expr_ty body;
        expr_ty orelse;

        if (_PyObject_HasAttrId(obj, &PyId_test)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_test);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &test, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"test\" missing from IfExp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &body, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from IfExp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_orelse)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_orelse);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &orelse, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"orelse\" missing from IfExp");
            return 1;
        }
        *out = IfExp(test, body, orelse, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Dict_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* keys;
        asdl_seq* values;

        if (_PyObject_HasAttrId(obj, &PyId_keys)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_keys);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Dict field \"keys\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            keys = _Py_asdl_seq_new(len, arena);
            if (keys == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(keys, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"keys\" missing from Dict");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_values)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_values);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Dict field \"values\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            values = _Py_asdl_seq_new(len, arena);
            if (values == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(values, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"values\" missing from Dict");
            return 1;
        }
        *out = Dict(keys, values, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Set_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* elts;

        if (_PyObject_HasAttrId(obj, &PyId_elts)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_elts);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Set field \"elts\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            elts = _Py_asdl_seq_new(len, arena);
            if (elts == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(elts, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"elts\" missing from Set");
            return 1;
        }
        *out = Set(elts, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)ListComp_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty elt;
        asdl_seq* generators;

        if (_PyObject_HasAttrId(obj, &PyId_elt)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_elt);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &elt, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"elt\" missing from ListComp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_generators)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_generators);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "ListComp field \"generators\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            generators = _Py_asdl_seq_new(len, arena);
            if (generators == NULL) goto failed;
            for (i = 0; i < len; i++) {
                comprehension_ty value;
                res = obj2ast_comprehension(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(generators, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"generators\" missing from ListComp");
            return 1;
        }
        *out = ListComp(elt, generators, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)SetComp_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty elt;
        asdl_seq* generators;

        if (_PyObject_HasAttrId(obj, &PyId_elt)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_elt);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &elt, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"elt\" missing from SetComp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_generators)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_generators);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "SetComp field \"generators\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            generators = _Py_asdl_seq_new(len, arena);
            if (generators == NULL) goto failed;
            for (i = 0; i < len; i++) {
                comprehension_ty value;
                res = obj2ast_comprehension(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(generators, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"generators\" missing from SetComp");
            return 1;
        }
        *out = SetComp(elt, generators, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)DictComp_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty key;
        expr_ty value;
        asdl_seq* generators;

        if (_PyObject_HasAttrId(obj, &PyId_key)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_key);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &key, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"key\" missing from DictComp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from DictComp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_generators)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_generators);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "DictComp field \"generators\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            generators = _Py_asdl_seq_new(len, arena);
            if (generators == NULL) goto failed;
            for (i = 0; i < len; i++) {
                comprehension_ty value;
                res = obj2ast_comprehension(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(generators, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"generators\" missing from DictComp");
            return 1;
        }
        *out = DictComp(key, value, generators, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)GeneratorExp_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty elt;
        asdl_seq* generators;

        if (_PyObject_HasAttrId(obj, &PyId_elt)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_elt);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &elt, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"elt\" missing from GeneratorExp");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_generators)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_generators);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "GeneratorExp field \"generators\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            generators = _Py_asdl_seq_new(len, arena);
            if (generators == NULL) goto failed;
            for (i = 0; i < len; i++) {
                comprehension_ty value;
                res = obj2ast_comprehension(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(generators, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"generators\" missing from GeneratorExp");
            return 1;
        }
        *out = GeneratorExp(elt, generators, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Yield_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty value;

        if (exists_not_none(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            value = NULL;
        }
        *out = Yield(value, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)YieldFrom_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty value;

        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from YieldFrom");
            return 1;
        }
        *out = YieldFrom(value, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Compare_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty left;
        asdl_int_seq* ops;
        asdl_seq* comparators;

        if (_PyObject_HasAttrId(obj, &PyId_left)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_left);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &left, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"left\" missing from Compare");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_ops)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_ops);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Compare field \"ops\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            ops = _Py_asdl_int_seq_new(len, arena);
            if (ops == NULL) goto failed;
            for (i = 0; i < len; i++) {
                cmpop_ty value;
                res = obj2ast_cmpop(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(ops, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"ops\" missing from Compare");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_comparators)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_comparators);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Compare field \"comparators\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            comparators = _Py_asdl_seq_new(len, arena);
            if (comparators == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(comparators, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"comparators\" missing from Compare");
            return 1;
        }
        *out = Compare(left, ops, comparators, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Call_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty func;
        asdl_seq* args;
        asdl_seq* keywords;
        expr_ty starargs;
        expr_ty kwargs;

        if (_PyObject_HasAttrId(obj, &PyId_func)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_func);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &func, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"func\" missing from Call");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_args)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_args);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Call field \"args\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            args = _Py_asdl_seq_new(len, arena);
            if (args == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(args, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"args\" missing from Call");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_keywords)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_keywords);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Call field \"keywords\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            keywords = _Py_asdl_seq_new(len, arena);
            if (keywords == NULL) goto failed;
            for (i = 0; i < len; i++) {
                keyword_ty value;
                res = obj2ast_keyword(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(keywords, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"keywords\" missing from Call");
            return 1;
        }
        if (exists_not_none(obj, &PyId_starargs)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_starargs);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &starargs, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            starargs = NULL;
        }
        if (exists_not_none(obj, &PyId_kwargs)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_kwargs);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &kwargs, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            kwargs = NULL;
        }
        *out = Call(func, args, keywords, starargs, kwargs, lineno, col_offset,
                    arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Num_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        object n;

        if (_PyObject_HasAttrId(obj, &PyId_n)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_n);
            if (tmp == NULL) goto failed;
            res = obj2ast_object(tmp, &n, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"n\" missing from Num");
            return 1;
        }
        *out = Num(n, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Str_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        string s;

        if (_PyObject_HasAttrId(obj, &PyId_s)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_s);
            if (tmp == NULL) goto failed;
            res = obj2ast_string(tmp, &s, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"s\" missing from Str");
            return 1;
        }
        *out = Str(s, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Bytes_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        bytes s;

        if (_PyObject_HasAttrId(obj, &PyId_s)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_s);
            if (tmp == NULL) goto failed;
            res = obj2ast_bytes(tmp, &s, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"s\" missing from Bytes");
            return 1;
        }
        *out = Bytes(s, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)NameConstant_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        singleton value;

        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_singleton(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from NameConstant");
            return 1;
        }
        *out = NameConstant(value, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Ellipsis_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {

        *out = Ellipsis(lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Attribute_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty value;
        identifier attr;
        expr_context_ty ctx;

        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from Attribute");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_attr)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_attr);
            if (tmp == NULL) goto failed;
            res = obj2ast_identifier(tmp, &attr, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"attr\" missing from Attribute");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_ctx)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_ctx);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr_context(tmp, &ctx, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"ctx\" missing from Attribute");
            return 1;
        }
        *out = Attribute(value, attr, ctx, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Subscript_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty value;
        slice_ty slice;
        expr_context_ty ctx;

        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from Subscript");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_slice)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_slice);
            if (tmp == NULL) goto failed;
            res = obj2ast_slice(tmp, &slice, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"slice\" missing from Subscript");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_ctx)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_ctx);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr_context(tmp, &ctx, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"ctx\" missing from Subscript");
            return 1;
        }
        *out = Subscript(value, slice, ctx, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Starred_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty value;
        expr_context_ty ctx;

        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from Starred");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_ctx)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_ctx);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr_context(tmp, &ctx, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"ctx\" missing from Starred");
            return 1;
        }
        *out = Starred(value, ctx, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Name_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        identifier id;
        expr_context_ty ctx;

        if (_PyObject_HasAttrId(obj, &PyId_id)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_id);
            if (tmp == NULL) goto failed;
            res = obj2ast_identifier(tmp, &id, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"id\" missing from Name");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_ctx)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_ctx);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr_context(tmp, &ctx, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"ctx\" missing from Name");
            return 1;
        }
        *out = Name(id, ctx, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)List_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* elts;
        expr_context_ty ctx;

        if (_PyObject_HasAttrId(obj, &PyId_elts)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_elts);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "List field \"elts\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            elts = _Py_asdl_seq_new(len, arena);
            if (elts == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(elts, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"elts\" missing from List");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_ctx)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_ctx);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr_context(tmp, &ctx, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"ctx\" missing from List");
            return 1;
        }
        *out = List(elts, ctx, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Tuple_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* elts;
        expr_context_ty ctx;

        if (_PyObject_HasAttrId(obj, &PyId_elts)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_elts);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "Tuple field \"elts\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            elts = _Py_asdl_seq_new(len, arena);
            if (elts == NULL) goto failed;
            for (i = 0; i < len; i++) {
                expr_ty value;
                res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(elts, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"elts\" missing from Tuple");
            return 1;
        }
        if (_PyObject_HasAttrId(obj, &PyId_ctx)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_ctx);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr_context(tmp, &ctx, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"ctx\" missing from Tuple");
            return 1;
        }
        *out = Tuple(elts, ctx, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of expr, but got %R", obj);
    failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_expr_context(PyObject* obj, expr_context_ty* out, PyArena* arena)
{
    int isinstance;

    isinstance = PyObject_IsInstance(obj, (PyObject *)Load_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Load;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Store_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Store;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Del_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Del;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)AugLoad_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = AugLoad;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)AugStore_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = AugStore;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Param_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Param;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of expr_context, but got %R", obj);
    return 1;
}

int
obj2ast_slice(PyObject* obj, slice_ty* out, PyArena* arena)
{
    int isinstance;

    PyObject *tmp = NULL;

    if (obj == Py_None) {
        *out = NULL;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Slice_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty lower;
        expr_ty upper;
        expr_ty step;

        if (exists_not_none(obj, &PyId_lower)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_lower);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &lower, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            lower = NULL;
        }
        if (exists_not_none(obj, &PyId_upper)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_upper);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &upper, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            upper = NULL;
        }
        if (exists_not_none(obj, &PyId_step)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_step);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &step, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            step = NULL;
        }
        *out = Slice(lower, upper, step, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)ExtSlice_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        asdl_seq* dims;

        if (_PyObject_HasAttrId(obj, &PyId_dims)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_dims);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "ExtSlice field \"dims\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            dims = _Py_asdl_seq_new(len, arena);
            if (dims == NULL) goto failed;
            for (i = 0; i < len; i++) {
                slice_ty value;
                res = obj2ast_slice(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(dims, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"dims\" missing from ExtSlice");
            return 1;
        }
        *out = ExtSlice(dims, arena);
        if (*out == NULL) goto failed;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)Index_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty value;

        if (_PyObject_HasAttrId(obj, &PyId_value)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_value);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &value, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from Index");
            return 1;
        }
        *out = Index(value, arena);
        if (*out == NULL) goto failed;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of slice, but got %R", obj);
    failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_boolop(PyObject* obj, boolop_ty* out, PyArena* arena)
{
    int isinstance;

    isinstance = PyObject_IsInstance(obj, (PyObject *)And_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = And;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Or_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Or;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of boolop, but got %R", obj);
    return 1;
}

int
obj2ast_operator(PyObject* obj, operator_ty* out, PyArena* arena)
{
    int isinstance;

    isinstance = PyObject_IsInstance(obj, (PyObject *)Add_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Add;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Sub_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Sub;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Mult_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Mult;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Div_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Div;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Mod_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Mod;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Pow_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Pow;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)LShift_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = LShift;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)RShift_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = RShift;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)BitOr_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = BitOr;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)BitXor_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = BitXor;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)BitAnd_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = BitAnd;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)FloorDiv_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = FloorDiv;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of operator, but got %R", obj);
    return 1;
}

int
obj2ast_unaryop(PyObject* obj, unaryop_ty* out, PyArena* arena)
{
    int isinstance;

    isinstance = PyObject_IsInstance(obj, (PyObject *)Invert_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Invert;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Not_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Not;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)UAdd_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = UAdd;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)USub_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = USub;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of unaryop, but got %R", obj);
    return 1;
}

int
obj2ast_cmpop(PyObject* obj, cmpop_ty* out, PyArena* arena)
{
    int isinstance;

    isinstance = PyObject_IsInstance(obj, (PyObject *)Eq_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Eq;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)NotEq_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = NotEq;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Lt_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Lt;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)LtE_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = LtE;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Gt_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Gt;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)GtE_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = GtE;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)Is_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = Is;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)IsNot_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = IsNot;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)In_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = In;
        return 0;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject *)NotIn_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        *out = NotIn;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of cmpop, but got %R", obj);
    return 1;
}

int
obj2ast_comprehension(PyObject* obj, comprehension_ty* out, PyArena* arena)
{
    PyObject* tmp = NULL;
    expr_ty target;
    expr_ty iter;
    asdl_seq* ifs;

    if (_PyObject_HasAttrId(obj, &PyId_target)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_target);
        if (tmp == NULL) goto failed;
        res = obj2ast_expr(tmp, &target, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"target\" missing from comprehension");
        return 1;
    }
    if (_PyObject_HasAttrId(obj, &PyId_iter)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_iter);
        if (tmp == NULL) goto failed;
        res = obj2ast_expr(tmp, &iter, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"iter\" missing from comprehension");
        return 1;
    }
    if (_PyObject_HasAttrId(obj, &PyId_ifs)) {
        int res;
        Py_ssize_t len;
        Py_ssize_t i;
        tmp = _PyObject_GetAttrId(obj, &PyId_ifs);
        if (tmp == NULL) goto failed;
        if (!PyList_Check(tmp)) {
            PyErr_Format(PyExc_TypeError, "comprehension field \"ifs\" must be a list, not a %.200s", tmp->ob_type->tp_name);
            goto failed;
        }
        len = PyList_GET_SIZE(tmp);
        ifs = _Py_asdl_seq_new(len, arena);
        if (ifs == NULL) goto failed;
        for (i = 0; i < len; i++) {
            expr_ty value;
            res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
            if (res != 0) goto failed;
            asdl_seq_SET(ifs, i, value);
        }
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"ifs\" missing from comprehension");
        return 1;
    }
    *out = comprehension(target, iter, ifs, arena);
    return 0;
failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_excepthandler(PyObject* obj, excepthandler_ty* out, PyArena* arena)
{
    int isinstance;

    PyObject *tmp = NULL;
    int lineno;
    int col_offset;

    if (obj == Py_None) {
        *out = NULL;
        return 0;
    }
    if (_PyObject_HasAttrId(obj, &PyId_lineno)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_lineno);
        if (tmp == NULL) goto failed;
        res = obj2ast_int(tmp, &lineno, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"lineno\" missing from excepthandler");
        return 1;
    }
    if (_PyObject_HasAttrId(obj, &PyId_col_offset)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_col_offset);
        if (tmp == NULL) goto failed;
        res = obj2ast_int(tmp, &col_offset, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"col_offset\" missing from excepthandler");
        return 1;
    }
    isinstance = PyObject_IsInstance(obj, (PyObject*)ExceptHandler_type);
    if (isinstance == -1) {
        return 1;
    }
    if (isinstance) {
        expr_ty type;
        identifier name;
        asdl_seq* body;

        if (exists_not_none(obj, &PyId_type)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_type);
            if (tmp == NULL) goto failed;
            res = obj2ast_expr(tmp, &type, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            type = NULL;
        }
        if (exists_not_none(obj, &PyId_name)) {
            int res;
            tmp = _PyObject_GetAttrId(obj, &PyId_name);
            if (tmp == NULL) goto failed;
            res = obj2ast_identifier(tmp, &name, arena);
            if (res != 0) goto failed;
            Py_CLEAR(tmp);
        } else {
            name = NULL;
        }
        if (_PyObject_HasAttrId(obj, &PyId_body)) {
            int res;
            Py_ssize_t len;
            Py_ssize_t i;
            tmp = _PyObject_GetAttrId(obj, &PyId_body);
            if (tmp == NULL) goto failed;
            if (!PyList_Check(tmp)) {
                PyErr_Format(PyExc_TypeError, "ExceptHandler field \"body\" must be a list, not a %.200s", tmp->ob_type->tp_name);
                goto failed;
            }
            len = PyList_GET_SIZE(tmp);
            body = _Py_asdl_seq_new(len, arena);
            if (body == NULL) goto failed;
            for (i = 0; i < len; i++) {
                stmt_ty value;
                res = obj2ast_stmt(PyList_GET_ITEM(tmp, i), &value, arena);
                if (res != 0) goto failed;
                asdl_seq_SET(body, i, value);
            }
            Py_CLEAR(tmp);
        } else {
            PyErr_SetString(PyExc_TypeError, "required field \"body\" missing from ExceptHandler");
            return 1;
        }
        *out = ExceptHandler(type, name, body, lineno, col_offset, arena);
        if (*out == NULL) goto failed;
        return 0;
    }

    PyErr_Format(PyExc_TypeError, "expected some sort of excepthandler, but got %R", obj);
    failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_arguments(PyObject* obj, arguments_ty* out, PyArena* arena)
{
    PyObject* tmp = NULL;
    asdl_seq* args;
    arg_ty vararg;
    asdl_seq* kwonlyargs;
    asdl_seq* kw_defaults;
    arg_ty kwarg;
    asdl_seq* defaults;

    if (_PyObject_HasAttrId(obj, &PyId_args)) {
        int res;
        Py_ssize_t len;
        Py_ssize_t i;
        tmp = _PyObject_GetAttrId(obj, &PyId_args);
        if (tmp == NULL) goto failed;
        if (!PyList_Check(tmp)) {
            PyErr_Format(PyExc_TypeError, "arguments field \"args\" must be a list, not a %.200s", tmp->ob_type->tp_name);
            goto failed;
        }
        len = PyList_GET_SIZE(tmp);
        args = _Py_asdl_seq_new(len, arena);
        if (args == NULL) goto failed;
        for (i = 0; i < len; i++) {
            arg_ty value;
            res = obj2ast_arg(PyList_GET_ITEM(tmp, i), &value, arena);
            if (res != 0) goto failed;
            asdl_seq_SET(args, i, value);
        }
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"args\" missing from arguments");
        return 1;
    }
    if (exists_not_none(obj, &PyId_vararg)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_vararg);
        if (tmp == NULL) goto failed;
        res = obj2ast_arg(tmp, &vararg, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        vararg = NULL;
    }
    if (_PyObject_HasAttrId(obj, &PyId_kwonlyargs)) {
        int res;
        Py_ssize_t len;
        Py_ssize_t i;
        tmp = _PyObject_GetAttrId(obj, &PyId_kwonlyargs);
        if (tmp == NULL) goto failed;
        if (!PyList_Check(tmp)) {
            PyErr_Format(PyExc_TypeError, "arguments field \"kwonlyargs\" must be a list, not a %.200s", tmp->ob_type->tp_name);
            goto failed;
        }
        len = PyList_GET_SIZE(tmp);
        kwonlyargs = _Py_asdl_seq_new(len, arena);
        if (kwonlyargs == NULL) goto failed;
        for (i = 0; i < len; i++) {
            arg_ty value;
            res = obj2ast_arg(PyList_GET_ITEM(tmp, i), &value, arena);
            if (res != 0) goto failed;
            asdl_seq_SET(kwonlyargs, i, value);
        }
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"kwonlyargs\" missing from arguments");
        return 1;
    }
    if (_PyObject_HasAttrId(obj, &PyId_kw_defaults)) {
        int res;
        Py_ssize_t len;
        Py_ssize_t i;
        tmp = _PyObject_GetAttrId(obj, &PyId_kw_defaults);
        if (tmp == NULL) goto failed;
        if (!PyList_Check(tmp)) {
            PyErr_Format(PyExc_TypeError, "arguments field \"kw_defaults\" must be a list, not a %.200s", tmp->ob_type->tp_name);
            goto failed;
        }
        len = PyList_GET_SIZE(tmp);
        kw_defaults = _Py_asdl_seq_new(len, arena);
        if (kw_defaults == NULL) goto failed;
        for (i = 0; i < len; i++) {
            expr_ty value;
            res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
            if (res != 0) goto failed;
            asdl_seq_SET(kw_defaults, i, value);
        }
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"kw_defaults\" missing from arguments");
        return 1;
    }
    if (exists_not_none(obj, &PyId_kwarg)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_kwarg);
        if (tmp == NULL) goto failed;
        res = obj2ast_arg(tmp, &kwarg, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        kwarg = NULL;
    }
    if (_PyObject_HasAttrId(obj, &PyId_defaults)) {
        int res;
        Py_ssize_t len;
        Py_ssize_t i;
        tmp = _PyObject_GetAttrId(obj, &PyId_defaults);
        if (tmp == NULL) goto failed;
        if (!PyList_Check(tmp)) {
            PyErr_Format(PyExc_TypeError, "arguments field \"defaults\" must be a list, not a %.200s", tmp->ob_type->tp_name);
            goto failed;
        }
        len = PyList_GET_SIZE(tmp);
        defaults = _Py_asdl_seq_new(len, arena);
        if (defaults == NULL) goto failed;
        for (i = 0; i < len; i++) {
            expr_ty value;
            res = obj2ast_expr(PyList_GET_ITEM(tmp, i), &value, arena);
            if (res != 0) goto failed;
            asdl_seq_SET(defaults, i, value);
        }
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"defaults\" missing from arguments");
        return 1;
    }
    *out = arguments(args, vararg, kwonlyargs, kw_defaults, kwarg, defaults,
                     arena);
    return 0;
failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_arg(PyObject* obj, arg_ty* out, PyArena* arena)
{
    PyObject* tmp = NULL;
    identifier arg;
    expr_ty annotation;

    if (_PyObject_HasAttrId(obj, &PyId_arg)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_arg);
        if (tmp == NULL) goto failed;
        res = obj2ast_identifier(tmp, &arg, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"arg\" missing from arg");
        return 1;
    }
    if (exists_not_none(obj, &PyId_annotation)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_annotation);
        if (tmp == NULL) goto failed;
        res = obj2ast_expr(tmp, &annotation, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        annotation = NULL;
    }
    *out = arg(arg, annotation, arena);
    return 0;
failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_keyword(PyObject* obj, keyword_ty* out, PyArena* arena)
{
    PyObject* tmp = NULL;
    identifier arg;
    expr_ty value;

    if (_PyObject_HasAttrId(obj, &PyId_arg)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_arg);
        if (tmp == NULL) goto failed;
        res = obj2ast_identifier(tmp, &arg, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"arg\" missing from keyword");
        return 1;
    }
    if (_PyObject_HasAttrId(obj, &PyId_value)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_value);
        if (tmp == NULL) goto failed;
        res = obj2ast_expr(tmp, &value, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"value\" missing from keyword");
        return 1;
    }
    *out = keyword(arg, value, arena);
    return 0;
failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_alias(PyObject* obj, alias_ty* out, PyArena* arena)
{
    PyObject* tmp = NULL;
    identifier name;
    identifier asname;

    if (_PyObject_HasAttrId(obj, &PyId_name)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_name);
        if (tmp == NULL) goto failed;
        res = obj2ast_identifier(tmp, &name, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"name\" missing from alias");
        return 1;
    }
    if (exists_not_none(obj, &PyId_asname)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_asname);
        if (tmp == NULL) goto failed;
        res = obj2ast_identifier(tmp, &asname, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        asname = NULL;
    }
    *out = alias(name, asname, arena);
    return 0;
failed:
    Py_XDECREF(tmp);
    return 1;
}

int
obj2ast_withitem(PyObject* obj, withitem_ty* out, PyArena* arena)
{
    PyObject* tmp = NULL;
    expr_ty context_expr;
    expr_ty optional_vars;

    if (_PyObject_HasAttrId(obj, &PyId_context_expr)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_context_expr);
        if (tmp == NULL) goto failed;
        res = obj2ast_expr(tmp, &context_expr, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        PyErr_SetString(PyExc_TypeError, "required field \"context_expr\" missing from withitem");
        return 1;
    }
    if (exists_not_none(obj, &PyId_optional_vars)) {
        int res;
        tmp = _PyObject_GetAttrId(obj, &PyId_optional_vars);
        if (tmp == NULL) goto failed;
        res = obj2ast_expr(tmp, &optional_vars, arena);
        if (res != 0) goto failed;
        Py_CLEAR(tmp);
    } else {
        optional_vars = NULL;
    }
    *out = withitem(context_expr, optional_vars, arena);
    return 0;
failed:
    Py_XDECREF(tmp);
    return 1;
}


static struct PyModuleDef _astmodule = {
  PyModuleDef_HEAD_INIT, "_ast"
};
PyMODINIT_FUNC
PyInit__ast(void)
{
    PyObject *m, *d;
    if (!init_types()) return NULL;
    m = PyModule_Create(&_astmodule);
    if (!m) return NULL;
    d = PyModule_GetDict(m);
    if (PyDict_SetItemString(d, "AST", (PyObject*)&AST_type) < 0) return NULL;
    if (PyModule_AddIntMacro(m, PyCF_ONLY_AST) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "mod", (PyObject*)mod_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Module", (PyObject*)Module_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Interactive", (PyObject*)Interactive_type) <
        0) return NULL;
    if (PyDict_SetItemString(d, "Expression", (PyObject*)Expression_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Suite", (PyObject*)Suite_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "stmt", (PyObject*)stmt_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "FunctionDef", (PyObject*)FunctionDef_type) <
        0) return NULL;
    if (PyDict_SetItemString(d, "ClassDef", (PyObject*)ClassDef_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Return", (PyObject*)Return_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Delete", (PyObject*)Delete_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Assign", (PyObject*)Assign_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "AugAssign", (PyObject*)AugAssign_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "For", (PyObject*)For_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "While", (PyObject*)While_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "If", (PyObject*)If_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "With", (PyObject*)With_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Raise", (PyObject*)Raise_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Try", (PyObject*)Try_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Assert", (PyObject*)Assert_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Import", (PyObject*)Import_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "ImportFrom", (PyObject*)ImportFrom_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Global", (PyObject*)Global_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Nonlocal", (PyObject*)Nonlocal_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Expr", (PyObject*)Expr_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Pass", (PyObject*)Pass_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Break", (PyObject*)Break_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Continue", (PyObject*)Continue_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "expr", (PyObject*)expr_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "BoolOp", (PyObject*)BoolOp_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "BinOp", (PyObject*)BinOp_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "UnaryOp", (PyObject*)UnaryOp_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Lambda", (PyObject*)Lambda_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "IfExp", (PyObject*)IfExp_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Dict", (PyObject*)Dict_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Set", (PyObject*)Set_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "ListComp", (PyObject*)ListComp_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "SetComp", (PyObject*)SetComp_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "DictComp", (PyObject*)DictComp_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "GeneratorExp", (PyObject*)GeneratorExp_type) <
        0) return NULL;
    if (PyDict_SetItemString(d, "Yield", (PyObject*)Yield_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "YieldFrom", (PyObject*)YieldFrom_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Compare", (PyObject*)Compare_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Call", (PyObject*)Call_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Num", (PyObject*)Num_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Str", (PyObject*)Str_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Bytes", (PyObject*)Bytes_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "NameConstant", (PyObject*)NameConstant_type) <
        0) return NULL;
    if (PyDict_SetItemString(d, "Ellipsis", (PyObject*)Ellipsis_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Attribute", (PyObject*)Attribute_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Subscript", (PyObject*)Subscript_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Starred", (PyObject*)Starred_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Name", (PyObject*)Name_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "List", (PyObject*)List_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Tuple", (PyObject*)Tuple_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "expr_context", (PyObject*)expr_context_type) <
        0) return NULL;
    if (PyDict_SetItemString(d, "Load", (PyObject*)Load_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Store", (PyObject*)Store_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Del", (PyObject*)Del_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "AugLoad", (PyObject*)AugLoad_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "AugStore", (PyObject*)AugStore_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Param", (PyObject*)Param_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "slice", (PyObject*)slice_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Slice", (PyObject*)Slice_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "ExtSlice", (PyObject*)ExtSlice_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Index", (PyObject*)Index_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "boolop", (PyObject*)boolop_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "And", (PyObject*)And_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Or", (PyObject*)Or_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "operator", (PyObject*)operator_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "Add", (PyObject*)Add_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Sub", (PyObject*)Sub_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Mult", (PyObject*)Mult_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Div", (PyObject*)Div_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Mod", (PyObject*)Mod_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Pow", (PyObject*)Pow_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "LShift", (PyObject*)LShift_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "RShift", (PyObject*)RShift_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "BitOr", (PyObject*)BitOr_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "BitXor", (PyObject*)BitXor_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "BitAnd", (PyObject*)BitAnd_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "FloorDiv", (PyObject*)FloorDiv_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "unaryop", (PyObject*)unaryop_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Invert", (PyObject*)Invert_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Not", (PyObject*)Not_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "UAdd", (PyObject*)UAdd_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "USub", (PyObject*)USub_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "cmpop", (PyObject*)cmpop_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Eq", (PyObject*)Eq_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "NotEq", (PyObject*)NotEq_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "Lt", (PyObject*)Lt_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "LtE", (PyObject*)LtE_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Gt", (PyObject*)Gt_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "GtE", (PyObject*)GtE_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "Is", (PyObject*)Is_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "IsNot", (PyObject*)IsNot_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "In", (PyObject*)In_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "NotIn", (PyObject*)NotIn_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "comprehension", (PyObject*)comprehension_type)
        < 0) return NULL;
    if (PyDict_SetItemString(d, "excepthandler", (PyObject*)excepthandler_type)
        < 0) return NULL;
    if (PyDict_SetItemString(d, "ExceptHandler", (PyObject*)ExceptHandler_type)
        < 0) return NULL;
    if (PyDict_SetItemString(d, "arguments", (PyObject*)arguments_type) < 0)
        return NULL;
    if (PyDict_SetItemString(d, "arg", (PyObject*)arg_type) < 0) return NULL;
    if (PyDict_SetItemString(d, "keyword", (PyObject*)keyword_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "alias", (PyObject*)alias_type) < 0) return
        NULL;
    if (PyDict_SetItemString(d, "withitem", (PyObject*)withitem_type) < 0)
        return NULL;
    return m;
}


PyObject* PyAST_mod2obj(mod_ty t)
{
    if (!init_types())
        return NULL;
    return ast2obj_mod(t);
}

/* mode is 0 for "exec", 1 for "eval" and 2 for "single" input */
mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode)
{
    mod_ty res;
    PyObject *req_type[3];
    char *req_name[] = {"Module", "Expression", "Interactive"};
    int isinstance;

    req_type[0] = (PyObject*)Module_type;
    req_type[1] = (PyObject*)Expression_type;
    req_type[2] = (PyObject*)Interactive_type;

    assert(0 <= mode && mode <= 2);

    if (!init_types())
        return NULL;

    isinstance = PyObject_IsInstance(ast, req_type[mode]);
    if (isinstance == -1)
        return NULL;
    if (!isinstance) {
        PyErr_Format(PyExc_TypeError, "expected %s node, got %.400s",
                     req_name[mode], Py_TYPE(ast)->tp_name);
        return NULL;
    }
    if (obj2ast_mod(ast, &res, arena) != 0)
        return NULL;
    else
        return res;
}

int PyAST_Check(PyObject* obj)
{
    if (!init_types())
        return -1;
    return PyObject_IsInstance(obj, (PyObject*)&AST_type);
}