error[E0308]: mismatched types --> $DIR/issue-43420-no-over-suggest.rs:8:9 | LL | foo(&a); | --- ^^ expected `&[u16]`, found `&Vec` | | | arguments to this function are incorrect | = note: expected reference `&[u16]` found reference `&Vec` note: function defined here --> $DIR/issue-43420-no-over-suggest.rs:4:4 | LL | fn foo(b: &[u16]) {} | ^^^ --------- error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.