error: `mut` must be attached to each individual binding
  --> $DIR/issue-80186-mut-binding-help-suggestion.rs:5:9
   |
LL |     let mut &x = &0;
   |         ^^^^^^
   |
   = note: `mut` may be followed by `variable` and `variable @ pattern`
help: add `mut` to each binding
   |
LL |     let &(mut x) = &0;
   |         ~~~~~~~~

error: aborting due to 1 previous error