[1.14 regression] Unpacking an iterator converts the inner type to `Any`

Bug Report

Unpacking an iterator into a list produces a list[Any] instead of the more specific type. This worked correctly in mypy 1.13.0 but no longer works in 1.14.0.

To Reproduce

from typing import reveal_type
x = [1, 2]
reveal_type([*reversed(x)])
y = [3, 4]
reveal_type([*map(str, y)])

Expected Behavior

In mypy 1.13.0:

x.py:3: note: Revealed type is "builtins.list[builtins.int]"
x.py:5: note: Revealed type is "builtins.list[builtins.str]"

Actual Behavior

In mypy 1.14.0:

x.py:3: note: Revealed type is "builtins.list[Any]"
x.py:5: note: Revealed type is "builtins.list[Any]"

Your Environment

• Mypy version used: 1.14.0
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: 3.13.0

Commencez par le reproducteur Python fourni et comparez la sortie de reveal_type entre mypy 1.13.0 et 1.14.0, en vous concentrant sur le décompactage de listes à partir de reversed et map. C’est terminé lorsque mypy signale list[int] et list[str] plutôt que list[Any] pour ces deux expressions sans flags spéciaux.