Fix runtime not generic note for type aliases, update for PathLike (#9512)

As a result of python/typeshed#4586

Co-authored-by: hauntsaninja <>

Author: hauntsaninja

mypy/typeanal.py

@@ -970,25 +970,28 @@ def tuple_type(self, items: List[Type]) -> TupleType:
 
 
 def get_omitted_any(disallow_any: bool, fail: MsgCallback, note: MsgCallback,
-                    typ: Type, fullname: Optional[str] = None,
+                    orig_type: Type, fullname: Optional[str] = None,
                     unexpanded_type: Optional[Type] = None) -> AnyType:
     if disallow_any:
         if fullname in nongen_builtins:
+            typ = orig_type
             # We use a dedicated error message for builtin generics (as the most common case).
             alternative = nongen_builtins[fullname]
             fail(message_registry.IMPLICIT_GENERIC_ANY_BUILTIN.format(alternative), typ,
                  code=codes.TYPE_ARG)
         else:
-            typ = unexpanded_type or typ
+            typ = unexpanded_type or orig_type
             type_str = typ.name if isinstance(typ, UnboundType) else format_type_bare(typ)
 
             fail(
-                message_registry.BARE_GENERIC.format(
-                    quote_type_string(type_str)),
+                message_registry.BARE_GENERIC.format(quote_type_string(type_str)),
                 typ,
                 code=codes.TYPE_ARG)
-
-            if fullname in GENERIC_STUB_NOT_AT_RUNTIME_TYPES:
+            base_type = get_proper_type(orig_type)
+            base_fullname = (
+                base_type.type.fullname if isinstance(base_type, Instance) else fullname
+            )
+            if base_fullname in GENERIC_STUB_NOT_AT_RUNTIME_TYPES:
                 # Recommend `from __future__ import annotations` or to put type in quotes
                 # (string literal escaping) for classes not generic at runtime
                 note(
@@ -1000,7 +1003,9 @@ def get_omitted_any(disallow_any: bool, fail: MsgCallback, note: MsgCallback,
 
         any_type = AnyType(TypeOfAny.from_error, line=typ.line, column=typ.column)
     else:
-        any_type = AnyType(TypeOfAny.from_omitted_generics, line=typ.line, column=typ.column)
+        any_type = AnyType(
+            TypeOfAny.from_omitted_generics, line=orig_type.line, column=orig_type.column
+        )
     return any_type
 
 

mypy/typeshed

@@ -1099,7 +1099,7 @@ from queue import Queue
 p: PathLike
 q: Queue
 [out]
-test.py:4: error: Missing type parameters for generic type "_PathLike"
+test.py:4: error: Missing type parameters for generic type "PathLike"
 test.py:4: note: Subscripting classes that are not generic at runtime may require escaping, see https://mypy.readthedocs.io/en/latest/common_issues.html#not-generic-runtime
 test.py:5: error: Missing type parameters for generic type "Queue"
 test.py:5: note: Subscripting classes that are not generic at runtime may require escaping, see https://mypy.readthedocs.io/en/latest/common_issues.html#not-generic-runtime