import torch
from torch.compiler import disable


class Container:
    def __init__(self):
        self._len_value = 0

    @property
    def _len(self):
        # Using __dict__.get instead of self._len_value triggers the bug
        return self.__dict__.get("_len_value", 0)

    @_len.setter
    def _len(self, value):
        self._len_value = value

    def add(self, n):
        self._len = self._len + n

    @disable()
    def __len__(self):
        return self._len


c = Container()


@torch.compile(backend="eager")
def f(x):
    c.add(x.shape[0])  # mutates c._len_value via property setter
    return len(c)       # reads c._len via @disable -> property getter -> __dict__.get


result = f(torch.randn(5))
assert result == 5, f"Expected 5, got {result}"