error[E0308]: mismatched types --> $DIR/non-whitespace-trimming-2.rs:4:311 | LL | ...13; let _: usize = 14; let _: usize = 15; let _: () = 42; let _: usize = 0; let _: usize = 1; let _: usize = 2; let _: usize = 3; let ... | -- ^^ expected `()`, found integer | | | expected due to this error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.