F821: Undefined name in match capture patterns

[mikeroll]

First of all, big thanks and congrats on shipping match support! Looks like it's not quite perfect yet as I catch a false-positive F821 with a very simple snippet:

def test(provided: int) -> int:
    match provided:
        case captured:
            return captured  # F821 Undefined name `captured`

❯ ruff --version
ruff 0.0.250

[charliermarsh]

Thank you!

[charliermarsh]

Will fix this. Please keep filing issues you run into with match. My focus was primarily on getting the syntax working (and traversals working within the linter), so the rules probably have rough edges.

[dpassen]

Not sure if this is the same issue or just very similar:

from dataclasses import dataclass


@dataclass
class Car:
    make: str
    model: str


match Car("Toyota", "Corolla"):
    case Car("Toyota", model):
        print(f"Nice {model}. I love what you do for me, Toyota!")

also yields an F821 Undefined name 'model'

[charliermarsh]

Same issue!