no-redundant-match-guard

Prefer literal patterns over equivalent equality guards

An equality guard on a newly bound match value repeats a test that the pattern can perform directly.
Instead, you SHOULD match the compared literal in the arm pattern.

- Category: style
- Level: warning
- Fix: automatic
- Scope: module

Reported

function classify(value: int32): string {
    return match (value) {
        matched if (matched === 0) => "zero"
        _ => "other"
    };
}
Accepted

function classify(value: int32): string {
    return match (value) {
        0 => "zero"
        _ => "other"
    };
}
Prior art

- Clippy · redundantguards

language/linter/src/rules/style/noredundantmatchguard.rs:8