Error when overriding a property created via decorators

Bug Report

When a parent class has a property, created via decorators with a getter and setter. If you attempt to override the fset of the parent by using decorators in the subclass, mypy throws an error.

To Reproduce

class A:
    def __init__(self, x: int):
        self._x = x

    @property
    def x(self) -> int:
        return self._x

    @x.setter
    def x(self, new_value: int):
        self._x = new_value


class B(A):
    def __init__(self):
        super().__init__(100)

    @A.x.setter
    def x(self, new_value: int):
        A.x.fset(self, new_value)

        print("Do something else ontop of the parent setter")

Expected Behavior

Mypy should produce no errors

Actual Behavior

Mypy produces the errors:

overloaded function has no attribute "setter" [attr-defined] on the decorator line in the subclass.
overloaded function has no attribute "fset" [attr-defined] on the call to fset in the subclass.

If instead of using a decorator, the property is created in the parent class via the property() function like below, then mypy does not produce any errors.

class A:
    def __init__(self, x: int):
        self._x = x

    def _get_x(self) -> int:
        return self._x

    def _set_x(self, new_value: int):
        self._x = new_value

    x = property(_get_x, _set_x)

Your Environment

• Mypy version used: 1.0.0
• Mypy command-line flags: None
• Mypy configuration options from mypy.ini (and other config files): Default configuration
• Python version used: 3.10.5

まず、提供された Python の例を mypy 1.0.0 とデフォルト設定で実行し、報告されたエラーを再現します。デコレートされたプロパティの型チェックのエントリーポイントを特定し、サブクラスでの setter のオーバーライドと親の fset へのアクセスを対象とするリグレッションテストを追加します。両方の例が attr-defined エラーなしで型チェックを通過すれば完了です。