Fix type narrowing for types.EllipsisType (#17003)

hauntsaninja · web-flow · commit 16abf5cbe08c · 2024-03-09T19:40:22.000-08:00
Fixes #17002
diff --git a/mypy/types.py b/mypy/types.py
@@ -1524,7 +1524,7 @@ def is_singleton_type(self) -> bool:
         return (
             self.type.is_enum
             and len(self.get_enum_values()) == 1
-            or self.type.fullname == "builtins.ellipsis"
+            or self.type.fullname in {"builtins.ellipsis", "types.EllipsisType"}
         )
 
     def get_enum_values(self) -> list[str]:

Original file line number	Diff line number	Diff line change
`@@ -1524,7 +1524,7 @@ def is_singleton_type(self) -> bool:`
`1524`	`1524`	`return (`
`1525`	`1525`	`self.type.is_enum`
`1526`	`1526`	`and len(self.get_enum_values()) == 1`
`1527`		`- or self.type.fullname == "builtins.ellipsis"`
	`1527`	`+ or self.type.fullname in {"builtins.ellipsis", "types.EllipsisType"}`
`1528`	`1528`	`)`
`1529`	`1529`
`1530`	`1530`	`def get_enum_values(self) -> list[str]:`