Reduce false positives from Y052 (#492)

CHANGELOG.md

@@ -6,6 +6,7 @@ Bugfixes
 * Allow the use of `typing_extensions.TypeVar` in stubs.
   `typing_extensions.TypeVar` has the *default* parameter,
   which only exists on Python 3.13+ when using `typing.TypeVar`.
+* Reduce false positives from Y052 in relation to enum subclasses.
 
 ## 24.4.1
 

pyi.py

@@ -701,11 +701,6 @@ def _analyse_typing_Literal(node: ast.Subscript) -> TypingLiteralAnalysis:
     )
 
 
-_KNOWN_ENUM_BASES = frozenset(
-    {"Enum", "Flag", "IntEnum", "IntFlag", "StrEnum", "ReprEnum"}
-)
-
-
 _COMMON_METACLASSES = {
     "type": "builtins",
     "ABCMeta": "abc",
@@ -739,10 +734,7 @@ def is_typeddict_class(self) -> bool:
 
     @cached_property
     def is_enum_class(self) -> bool:
-        return any(
-            self.contains_in_bases(enum_cls, from_={"enum"})
-            for enum_cls in _KNOWN_ENUM_BASES
-        )
+        return any(base_name.endswith(("Enum", "Flag")) for base_name in self.bases_map)
 
     @cached_property
     def is_metaclass(self) -> bool:

tests/attribute_annotations.pyi

@@ -146,3 +146,8 @@ class Enum6(ReprEnum):
 
 class Enum7(enum.Enum):
     FOO = "foo"
+
+class SpecialEnum(enum.Enum): ...
+
+class SubclassOfSpecialEnum(SpecialEnum):
+    STILL_OKAY = "foo"