more

CHANGELOG.md

@@ -28,7 +28,7 @@ class Pet(Enum):
     DOG: int
 
     # Mypy will now issue a warning if it detects this situation in type stubs:
-    # Detected an enum in a type stub with zero members.
+    # Detected enum "Pet" in a type stub with zero members.
     # There is a chance this is due to a recent change in the semantics of enum membership.
     # If so, use `member = value` to mark an enum member, instead of `member: type
 

mypy/checker.py

@@ -2598,10 +2598,10 @@ def check_enum(self, defn: ClassDef) -> None:
             if base.is_enum and base.fullname not in ENUM_BASES:
                 self.check_final_enum(defn, base)
 
-        if self.is_stub and not self.is_typeshed_stub and self.tree.fullname != "enum":
+        if self.is_stub and self.tree.fullname not in {"enum", "_typeshed"}:
             if not defn.info.enum_members:
                 self.fail(
-                    "Detected an enum in a type stub with zero members. "
+                    f'Detected enum "{defn.info.fullname}" in a type stub with zero members. '
                     "There is a chance this is due to a recent change in the semantics of "
                     "enum membership. If so, use `member = value` to mark an enum member, "
                     "instead of `member: type`",

test-data/unit/check-enum.test

@@ -1788,7 +1788,7 @@ import lib
 
 [file lib.pyi]
 from enum import Enum
-class A(Enum):  # E: Detected an enum in a type stub with zero members. There is a chance this is due to a recent change in the semantics of enum membership. If so, use `member = value` to mark an enum member, instead of `member: type` \
+class A(Enum):  # E: Detected enum "lib.A" in a type stub with zero members. There is a chance this is due to a recent change in the semantics of enum membership. If so, use `member = value` to mark an enum member, instead of `member: type` \
                 # N: See https://typing.readthedocs.io/en/latest/spec/enums.html#defining-members
     x: int
 class B(A):  # E: Cannot extend enum with existing members: "A"
@@ -1797,7 +1797,7 @@ class B(A):  # E: Cannot extend enum with existing members: "A"
 class C(Enum):
     x = 1
 class D(C):  # E: Cannot extend enum with existing members: "C" \
-             # E: Detected an enum in a type stub with zero members. There is a chance this is due to a recent change in the semantics of enum membership. If so, use `member = value` to mark an enum member, instead of `member: type` \
+             # E: Detected enum "lib.D" in a type stub with zero members. There is a chance this is due to a recent change in the semantics of enum membership. If so, use `member = value` to mark an enum member, instead of `member: type` \
              # N: See https://typing.readthedocs.io/en/latest/spec/enums.html#defining-members
     x: int   # E: Cannot assign to final name "x"
 [builtins fixtures/bool.pyi]