from typing import *

P = ParamSpec("P")
RV = TypeVar("RV", covariant=True)

class CachedMethod(Protocol, Generic[P, RV]):
    @staticmethod
    def clear_cache(cache: Any) -> None: ...

    def __call__(self, *args: P.args, **kwargs: P.kwargs) -> RV: ...

def cache_on_self(fn: Callable[Concatenate[Any, P], RV]) -> CachedMethod[P, RV]:
    ...

class Foo:
    @cache_on_self
    def pointwise_read_writes(self): ...

    def f(self):
        self.pointwise_read_writes.clear_cache(self) # E: ERROR 20:9-47: Object of class `MethodType` has no attribute `clear_cache`