This works for me with this more minimal example:

import enum

class X(enum.Enum):
    a = 1

reveal_type(list(X))

The output is Revealed type is 'builtins.list[enum.Enum*]' with no other errors.

Are you using the latest version of mypy? We have made several fixes to enum in recent versions.

Thank you. Yes, I have the latest version of mypy. To make it clear: My example is working for you correctly with no complaint from mypy? It seems to me that mypy is not able to understand that Enum type can be unpack as a iterable.

The original example is confirmed on master, but it looks like this is another manifestation of #3210 (a duplicate?)

@JelleZijlstra note that the revealed type shows builtins.list[enum.Enum*], while it should be builtins.list[__main__.Sample*].

I'm pretty sure it's a duplicate.

Agreed.