bpo-40334: Use old compiler when compile mode is func_type (GH-19692)
This is invoked by mypy, using ast.parse(source, "<func_type>", "func_type"). Since the new grammar doesn't yet support the func_type_input start symbol we must use the old compiler in this case to prevent a crash.
https://bugs.python.org/issue40334
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index ce3561e..14c3e96 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -817,7 +817,7 @@
goto error;
int current_use_peg = PyInterpreterState_Get()->config._use_peg_parser;
- if (flags & PyCF_TYPE_COMMENTS || feature_version >= 0) {
+ if (flags & PyCF_TYPE_COMMENTS || feature_version >= 0 || compile_mode == 3) {
PyInterpreterState_Get()->config._use_peg_parser = 0;
}
result = Py_CompileStringObject(str, filename, start[compile_mode], &cf, optimize);