False-positive for functools.cache decorated methods

[vemel]

Describe the bug

pyright marks methods wrapped with functools.cache/functools.lru_cache decorator calls as error: Argument missing for parameter "self". Functions are not affected, only methods.

This bug was introduced in 1.1.187. 1.1.186 is not affected.

To Reproduce

Run pyright on this sample:

from functools import cache


class A:
    @cache
    def has_cache(self) -> None:
        print(self)

    def no_cache(self) -> None:
        print(self)


a = A()
a.has_cache()  #  error: Argument missing for parameter "self"
a.has_cache(a)  # no typing errors, but obviously a RuntimeError
a.no_cache()  # all good

Expected behavior
No error

VS Code extension or command-line
Command line with pyright 1.1.187.

[erictraut]

Thanks for creating the issue. Based on my understanding of PEP 612, pyright's current behavior is correct.

I've asked for input from the PEP 612 authors and the broader Python typing community here.

[erictraut]

The typeshed maintainers have decided to revert the change to functools.pyi for now. I've incorporated the updated stubs, so this problem will be fixed in the next release of pyright.

[erictraut]

This is included in pyright 1.1.190, which I just published. It will also be included in the next release of pylance.