New lint to detect usage of [args @ ..]

[Centri3]

What it does

Detects usage of [args @ ..] and suggests switching it to args.

Can probably be named redundant_rest_pattern.

@rustbot claim

Advantage

• Is clearer; a 1-len slice with a rest pattern is(should be) identical to just args.

Drawbacks

None.

Example

if let Some([args @ ..]) = init { ... }

Could be written as:

if let Some(args) = init { ... }