src/test/ui/lint/must_use-unit.rs

   1 #![feature(never_type)]
   2 #![deny(unused_must_use)]
   3
   4 #[must_use]
   5 fn foo() {}
   6
   7 #[must_use]
   8 fn bar() -> ! {
   9     unimplemented!()
  10 }
  11
  12 fn main() {
  13     foo(); //~ unused return value of `foo`
  14
  15     bar(); //~ unused return value of `bar`
  16 }