Pattern matching throws false positive F821 when the value comes from the pattern

[Vegemash]

Woo pattern matching! Thank you for supporting 99% of our codebase, here's some bugs :P

class TheEyesHaveIt:
    def __init__(self, i=None, eye=None):
        self.i = i
        self.eye = eye


def match_the_thing(thing: TheEyesHaveIt) -> None:
    match thing:
        case TheEyesHaveIt(i=value) if value:
            print(f"The i's have it at {value}")
        case TheEyesHaveIt(eye=value) if value:
            print(f"The eyes have it at {value}")


a = TheEyesHaveIt(eye="foo")
b = TheEyesHaveIt(i="bar")
match_the_thing(a)
match_the_thing(b)

All those values are marked as undefined names "F821 Undefined name `value`".

[charliermarsh]

I think these were fixed by #3098, but I'll double check.

I'll probably cut a new release today to get that out.