Error message improvement: Manual reborrowing with &mut *variable #81059
Description
In this testcase, I wanted to reborrow outer, but accidentally wrote &mut outer instead of &mut *outer. However, the error's suggestion was try removing `&mut` here which wouldn't have worked.
It would be better to have the suggestion try adding `*` here in this particular scenario.
fn test(outer: &mut Option<i32>) { match (&mut outer, 23) { (Some(inner), _) => { *inner = 17; }, _ => { *outer = Some(2); }, } } Compiling playground v0.0.1 (/playground) error[E0596]: cannot borrow `outer` as mutable, as it is not declared as mutable --> src/lib.rs:2:12 | 2 | match (&mut outer, 23) { | ^^^^^^^^^^ | | | cannot borrow as mutable | try removing `&mut` here error: aborting due to previous error