bpo-43892: Make match patterns explicit in the AST (GH-25585)
Co-authored-by: Brandt Bucher <brandtbucher@gmail.com>
diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
index 5276b2f..126e904 100644
--- a/Python/ast_unparse.c
+++ b/Python/ast_unparse.c
@@ -3,6 +3,11 @@
#include <float.h> // DBL_MAX_10_EXP
#include <stdbool.h>
+/* This limited unparser is used to convert annotations back to strings
+ * during compilation rather than being a full AST unparser.
+ * See ast.unparse for a full unparser (written in Python)
+ */
+
static PyObject *_str_open_br;
static PyObject *_str_dbl_open_br;
static PyObject *_str_close_br;
@@ -912,11 +917,11 @@ append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, int level)
return append_ast_tuple(writer, e, level);
case NamedExpr_kind:
return append_named_expr(writer, e, level);
- default:
- PyErr_SetString(PyExc_SystemError,
- "unknown expression kind");
- return -1;
+ // No default so compiler emits a warning for unhandled cases
}
+ PyErr_SetString(PyExc_SystemError,
+ "unknown expression kind");
+ return -1;
}
static int