error: unreachable expression
  --> $DIR/expr_block.rs:10:9
   |
LL |         return;
   |         ------ any code following this expression is unreachable
LL |         22
   |         ^^ unreachable expression
   |
note: the lint level is defined here
  --> $DIR/expr_block.rs:4:9
   |
LL | #![deny(unreachable_code)]
   |         ^^^^^^^^^^^^^^^^

error: unreachable statement
  --> $DIR/expr_block.rs:25:9
   |
LL |         return;
   |         ------ any code following this expression is unreachable
LL |         println!("foo");
   |         ^^^^^^^^^^^^^^^ unreachable statement
   |
   = note: this error originates in the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 2 previous errors