error[E0308]: mismatched types --> $DIR/issue-4517.rs:5:9 | LL | bar(foo); | --- ^^^ expected `usize`, found array `[u8; 4]` | | | arguments to this function are incorrect | note: function defined here --> $DIR/issue-4517.rs:1:4 | LL | fn bar(int_param: usize) {} | ^^^ ---------------- error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.