error: unreachable expression
  --> $DIR/expr_block.rs:20:9
   |
LL |         22 //~ ERROR unreachable
   |         ^^
   |
note: lint level defined here
  --> $DIR/expr_block.rs:14:9
   |
LL | #![deny(unreachable_code)]
   |         ^^^^^^^^^^^^^^^^

error: unreachable statement
  --> $DIR/expr_block.rs:35:9
   |
LL |         println!("foo");
   |         ^^^^^^^^^^^^^^^^
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to 2 previous errors