error[E0308]: mismatched types
  --> $DIR/issue-19109.rs:14:5
   |
13 | fn function(t: &mut Trait) {
   |                            - help: try adding a return type: `-> *mut Trait`
14 |     t as *mut Trait
   |     ^^^^^^^^^^^^^^^ expected (), found *-ptr
   |
   = note: expected type `()`
              found type `*mut Trait`

error: aborting due to previous error