[mypyc] Fix direct __dict__ access on inner functions in new Python (#…

…16084)

Fixes #16077

mypyc/codegen/emitclass.py

@@ -217,7 +217,7 @@ def generate_class(cl: ClassIR, module: str, emitter: Emitter) -> None:
  fields["tp_name"] = f'"{name}"'
 
  generate_full = not cl.is_trait and not cl.builtin_base
- needs_getseters = cl.needs_getseters or not cl.is_generated
+ needs_getseters = cl.needs_getseters or not cl.is_generated or cl.has_dict
 
  if not cl.builtin_base:
  fields["tp_new"] = new_name
@@ -886,6 +886,9 @@ def generate_getseters_table(cl: ClassIR, name: str, emitter: Emitter) -> None:
  else:
  emitter.emit_line("NULL, NULL, NULL},")
 
+ if cl.has_dict:
+ emitter.emit_line('{"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},')
+
  emitter.emit_line("{NULL} /* Sentinel */")
  emitter.emit_line("};")
 

mypyc/test-data/run-functions.test

@@ -1256,3 +1256,33 @@ def foo(**kwargs: Unpack[Person]) -> None:
 foo(name='Jennifer', age=38)
 [out]
 Jennifer
+
+[case testNestedFunctionDunderDict312]
+import sys
+
+def foo() -> None:
+ def inner() -> str: return "bar"
+ print(inner.__dict__) # type: ignore[attr-defined]
+ inner.__dict__.update({"x": 1}) # type: ignore[attr-defined]
+ print(inner.__dict__) # type: ignore[attr-defined]
+ print(inner.x) # type: ignore[attr-defined]
+
+if sys.version_info >= (3, 12): # type: ignore
+ foo()
+[out]
+[out version>=3.12]
+{}
+{'x': 1}
+1
+
+[case testFunctoolsUpdateWrapper]
+import functools
+
+def bar() -> None:
+ def inner() -> str: return "bar"
+ functools.update_wrapper(inner, bar) # type: ignore
+ print(inner.__dict__) # type: ignore
+
+bar()
+[out]
+{'__module__': 'native', '__name__': 'bar', '__qualname__': 'bar', '__doc__': None, '__wrapped__': <built-in function bar>}