error: unreachable expression --> $DIR/expr_box.rs:6:13 | LL | let x = box return; | ^^^^------ | | | | | any code following this expression is unreachable | unreachable expression | note: the lint level is defined here --> $DIR/expr_box.rs:3:9 | LL | #![deny(unreachable_code)] | ^^^^^^^^^^^^^^^^ error: aborting due to previous error