stubtest: fallback to getattr_static on AttributeError (#13285)

mypy/stubtest.py

@@ -364,7 +364,10 @@ class SubClass(runtime):  # type: ignore
         stub_to_verify = next((t.names[entry].node for t in stub.mro if entry in t.names), MISSING)
         assert stub_to_verify is not None
         try:
-            runtime_attr = getattr(runtime, mangled_entry, MISSING)
+            try:
+                runtime_attr = getattr(runtime, mangled_entry)
+            except AttributeError:
+                runtime_attr = inspect.getattr_static(runtime, mangled_entry, MISSING)
         except Exception:
             # Catch all exceptions in case the runtime raises an unexpected exception
             # from __getattr__ or similar.

mypy/test/teststubtest.py

@@ -613,6 +613,26 @@ def read_write_attr(self, val): self._val = val
             """,
             error=None,
         )
+        yield Case(
+            stub="""
+            class FineAndDandy:
+                @property
+                def attr(self) -> int: ...
+            """,
+            runtime="""
+            class _EvilDescriptor:
+                def __get__(self, instance, ownerclass=None):
+                    if instance is None:
+                        raise AttributeError('no')
+                    return 42
+                def __set__(self, instance, value):
+                    raise AttributeError('no')
+
+            class FineAndDandy:
+                attr = _EvilDescriptor()
+            """,
+            error=None,
+        )
 
     @collect_cases
     def test_var(self) -> Iterator[Case]: