unused_parens false-positive on mutable binding inside &-pattern

[sinkuu]

for &(mut _x) in &[1, 2, 3] {
    // _x: mutable binding to a copied element
}

unused_parens suggests removing parens, but doing so will turn the pattern into a &mut pattern.

warning: unnecessary parentheses around pattern
 --> test.rs:2:10
  |
2 |     for &(mut _x) in &[1, 2, 3] {
  |          ^^^^^^^^ help: remove these parentheses
  |

[Centril]

Duplicate of #55342.