temporary-assignment

Disallow assignments into discarded struct and tuple constructions

Assigning through a freshly constructed struct or tuple updates a value discarded at the end of the statement.
Instead, you SHOULD construct the intended value directly or bind it before assigning into it.

- Category: suspicious
- Level: warning
- Fix: none
- Scope: module

Reported

struct Point {
    x: int32;
}

function discard(): void {
    Point { x: 1 }.x = 2;
}
Accepted

struct Point {
    x: int32;
}

function retain(): Point {
    let point = Point { x: 1 };
    point.x = 2;
    return point;
}
Prior art

- Clippy · temporaryassignment

language/linter/src/rules/suspicious/temporaryassignment.rs:6