From bc28805570ae3e8835a5d502ae9ab15c52449f77 Mon Sep 17 00:00:00 2001 From: Guido van Rossum Date: Thu, 23 Apr 2020 15:42:56 -0700 Subject: [PATCH] bpo-40334: Use old compiler when compile mode is func_type (GH-19692) This is invoked by mypy, using ast.parse(source, "", "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 --- Python/bltinmodule.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c index ce3561e4c08..14c3e96fb51 100644 --- a/Python/bltinmodule.c +++ b/Python/bltinmodule.c @@ -817,7 +817,7 @@ builtin_compile_impl(PyObject *module, PyObject *source, PyObject *filename, 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);