[BUG] no member named ‘__pyx_outer_scope’

[starflows]

Describe the bug
Cython generates c code which fails to compile

To Reproduce
Code to reproduce the behaviour:

# test.py
def func(arg1, arg2):
    @arg1([x for x in arg2])
    async def method():
        pass

$ cython -3 test.py
$ cc -I/usr/include/python3.9 -c -o test.o test.c

test.c: In function ‘__pyx_pf_4test_func’:
test.c:2209:34: error: ‘struct __pyx_obj_4test___pyx_scope_struct__func’ has no member named ‘__pyx_outer_scope’
 2209 |     if (unlikely(!__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) { __Pyx_RaiseClosureNameError("arg2"); __PYX_ERR(0, 2, __pyx_L1_error) }
      |                                  ^~
test.c:994:43: note: in definition of macro ‘unlikely’
  994 |   #define unlikely(x) __builtin_expect(!!(x), 0)
      |                                           ^
test.c:2210:49: error: ‘struct __pyx_obj_4test___pyx_scope_struct__func’ has no member named ‘__pyx_outer_scope’
 2210 |     if (likely(PyList_CheckExact(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) || PyTuple_CheckExact(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) {
      |                                                 ^~
test.c:993:43: note: in definition of macro ‘likely’
  993 |   #define likely(x)   __builtin_expect(!!(x), 1)
      |                                           ^
/usr/include/python3.9/object.h:130:42: note: in expansion of macro ‘_PyObject_CAST_CONST’
  130 | #define Py_IS_TYPE(ob, type) _Py_IS_TYPE(_PyObject_CAST_CONST(ob), type)
      |                                          ^~~~~~~~~~~~~~~~~~~~
/usr/include/python3.9/listobject.h:26:31: note: in expansion of macro ‘Py_IS_TYPE’
   26 | #define PyList_CheckExact(op) Py_IS_TYPE(op, &PyList_Type)
      |                               ^~~~~~~~~~
test.c:2210:16: note: in expansion of macro ‘PyList_CheckExact’
 2210 |     if (likely(PyList_CheckExact(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) || PyTuple_CheckExact(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) {
      |                ^~~~~~~~~~~~~~~~~
In file included from /usr/include/python3.9/pytime.h:6,
                 from /usr/include/python3.9/Python.h:94,
                 from test.c:16:
test.c:2210:122: error: ‘struct __pyx_obj_4test___pyx_scope_struct__func’ has no member named ‘__pyx_outer_scope’
 2210 |     if (likely(PyList_CheckExact(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) || PyTuple_CheckExact(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) {
      |                                                                                                                          ^~
/usr/include/python3.9/object.h:113:53: note: in definition of macro ‘_PyObject_CAST_CONST’
  113 | #define _PyObject_CAST_CONST(op) ((const PyObject*)(op))
      |                                                     ^~
/usr/include/python3.9/tupleobject.h:28:32: note: in expansion of macro ‘Py_IS_TYPE’
   28 | #define PyTuple_CheckExact(op) Py_IS_TYPE(op, &PyTuple_Type)
      |                                ^~~~~~~~~~
test.c:2210:88: note: in expansion of macro ‘PyTuple_CheckExact’
 2210 |     if (likely(PyList_CheckExact(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) || PyTuple_CheckExact(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2)) {
      |                                                                                        ^~~~~~~~~~~~~~~~~~
test.c:2211:34: error: ‘struct __pyx_obj_4test___pyx_scope_struct__func’ has no member named ‘__pyx_outer_scope’
 2211 |       __pyx_t_4 = __pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2; __Pyx_INCREF(__pyx_t_4); __pyx_t_5 = 0;
      |                                  ^~
test.c:2214:67: error: ‘struct __pyx_obj_4test___pyx_scope_struct__func’ has no member named ‘__pyx_outer_scope’
 2214 |       __pyx_t_5 = -1; __pyx_t_4 = PyObject_GetIter(__pyx_cur_scope->__pyx_outer_scope->__pyx_v_arg2); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 2, __pyx_L1_error)
      |                                                                   ^~
test.c:2250:40: error: ‘struct __pyx_obj_4test___pyx_scope_struct__func’ has no member named ‘__pyx_7genexpr__pyx_v_x’
 2250 |       __Pyx_XDECREF_SET(__pyx_cur_scope->__pyx_7genexpr__pyx_v_x, __pyx_t_7);
      |                                        ^~
test.c:1119:38: note: in definition of macro ‘__Pyx_XDECREF_SET’
 1119 |         PyObject *tmp = (PyObject *) r;\
      |                                      ^
test.c:2250:40: error: ‘struct __pyx_obj_4test___pyx_scope_struct__func’ has no member named ‘__pyx_7genexpr__pyx_v_x’
 2250 |       __Pyx_XDECREF_SET(__pyx_cur_scope->__pyx_7genexpr__pyx_v_x, __pyx_t_7);
      |                                        ^~
test.c:1120:9: note: in definition of macro ‘__Pyx_XDECREF_SET’
 1120 |         r = v; __Pyx_XDECREF(tmp);\
      |         ^
test.c:2253:79: error: ‘struct __pyx_obj_4test___pyx_scope_struct__func’ has no member named ‘__pyx_7genexpr__pyx_v_x’
 2253 |       if (unlikely(__Pyx_ListComp_Append(__pyx_t_3, (PyObject*)__pyx_cur_scope->__pyx_7genexpr__pyx_v_x))) __PYX_ERR(0, 2, __pyx_L1_error)
      |                                                                               ^~
test.c:994:43: note: in definition of macro ‘unlikely’
  994 |   #define unlikely(x) __builtin_expect(!!(x), 0)
      |                                           ^

Expected behavior
The code compiles without errors

Environment (please complete the following information):

• OS: Linux
• Python 3.9.6
• Cython version 0.29.24 and Cython version 3.0.0a9
• cc (GCC) 11.1.0

Additional context

This works:

# test.py
def func(arg1, arg2):
    list_ = [x for x in arg2]
    @arg1(list_)
    async def method():
        pass

[da-woods]

If doesn't specifically look to be related to async - you get the same issue with a regular def function.

I suspect the decorator is just analysed in the scope of method at some point rather than in the scope of func.