Strange error when declaring `@final` property

Bug Report

Consider this code:

from typing import final

class A:
    def __init__(self):
        self._x = 4

    @property
    @final  # E: @final should be applied only to overload implementation
    def x(self) -> int:
        return self._x

    @x.setter
    def x(self, value) -> None:
        self._x = value
        
        
class B(A):

    @property  # E: Cannot override final attribute "x" (previously declared in base class "A")
    def x(self) -> int:
        return self._x

    @x.setter
    def x(self, value) -> None:
        self._x = value

https://mypy-play.net/?mypy=latest&python=3.11&gist=a4a1981a3db4ac546b9947bb344a5fd5

Mypy complains that @final is not applied to the "overload implementation", but the property is still successfully declared final.

I tried moving the @final decorator to the setter – in that case, mypy's first error goes away, but then also the second error vanishes, meaning that x wasn't actually marked as final.

(I also tried moving @final above @property but that produces the same result.)

Environment:
See mypy-play link above.

Inizia con l’esempio riproducibile nell’issue o con il caso mypy-play collegato, confrontando il posizionamento di @final sul getter e sul setter della property. Traccia il modo in cui mypy convalida i decoratori final e registra gli attributi della property, quindi aggiungi la copertura per questa dichiarazione e verifica che le diagnosi riflettano coerentemente se la property è final.