no-single-binding-match

Prefer direct evaluation over a match with one irrefutable arm

A match with one unguarded binding arm accepts every value and performs no selection.
Instead, you SHOULD bind the value directly in a do expression.

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

Reported

function double(value: int32): int32 {
    return match (value) {
        matched => matched * 2
    };
}
Accepted

function double(value: int32): int32 {
    return do {
        const matched = value;
        matched * 2
    };
}
Prior art

- Clippy · matchsinglebinding

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