error: this let-binding has unit value. Consider omitting `let _x =` --> $DIR/let_unit.rs:14:5 | 14 | let _x = println!("x"); | ^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D let-unit-value` implied by `-D warnings` error: this let-binding has unit value. Consider omitting `let _a =` --> $DIR/let_unit.rs:18:9 | 18 | let _a = (); | ^^^^^^^^^^^^