Make TypeAlias stub a valid annotation (#4354)

shannonzhu · web-flow · commit b45e6cfbf655 · 2020-07-22T17:31:21.000-07:00
diff --git a/third_party/2and3/typing_extensions.pyi b/third_party/2and3/typing_extensions.pyi
@@ -92,4 +92,4 @@ Annotated: _SpecialForm = ...
 _AnnotatedAlias: Any = ...  # undocumented
 
 # TypeAlias is a (non-subscriptable) special form.
-TypeAlias: object
+class TypeAlias: ...
