error: unreachable expression
  --> $DIR/expr_tup.rs:20:38
   |
20 |     let x: (usize, usize) = (return, 2);
   |                                      ^
   |
note: lint level defined here
  --> $DIR/expr_tup.rs:14:9
   |
14 | #![deny(unreachable_code)]
   |         ^^^^^^^^^^^^^^^^

error: unreachable expression
  --> $DIR/expr_tup.rs:25:29
   |
25 |     let x: (usize, usize) = (2, return);
   |                             ^^^^^^^^^^^

error: aborting due to 2 previous errors