add functional enum test

Author: terencehonles

test-data/unit/check-python310.test

@@ -1520,6 +1520,24 @@ match m:
 
 [builtins fixtures/tuple.pyi]
 
+[case testMatchLiteralPatternEnumFunctional]
+from enum import Enum
+from typing import NoReturn
+def assert_never(x: NoReturn) -> None: ...
+
+Medal = Enum('Medal', 'gold silver bronze')
+m: Medal
+
+match m:
+    case Medal.gold:
+        reveal_type(m)  # N: Revealed type is "Literal[__main__.Medal.gold]"
+    case Medal.silver:
+        reveal_type(m)  # N: Revealed type is "Literal[__main__.Medal.silver]"
+    case Medal.bronze:
+        reveal_type(m)  # N: Revealed type is "Literal[__main__.Medal.bronze]"
+    case _ as unreachable:
+        assert_never(unreachable)
+
 [case testMatchLiteralPatternEnumCustomEquals-skip]
 from enum import Enum
 class Medal(Enum):