ruff/crates/red_knot_python_semantic/resources/mdtest/narrow/match.md

Narrowing for match statements

Single match pattern

def _(flag: bool):
    x = None if flag else 1

    reveal_type(x)  # revealed: None | Literal[1]

    y = 0

    match x:
        case None:
            y = x

    reveal_type(y)  # revealed: Literal[0] | None