clone-on-copy

Disallow cloning values whose checked type is Copy

Calling clone on a Copy value implies that duplication may require explicit work.
Instead, you SHOULD use the value directly and let Copy semantics duplicate it implicitly.

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

Reported

function duplicate(value: int32): int32 {
    return value.clone();
}
Accepted

function duplicate(value: int32): int32 {
    return value;
}
Prior art

- Clippy · cloneoncopy

language/linter/src/rules/performance/cloneoncopy.rs:8