tests/ui/issues/issue-16256.stderr

   1 warning: unused closure that must be used
   2   --> $DIR/issue-16256.rs:6:5
   3    |
   4 LL |     |c: u8| buf.push(c);
   5    |     ^^^^^^^^^^^^^^^^^^^
   6    |
   7    = note: closures are lazy and do nothing unless called
   8    = note: `#[warn(unused_must_use)]` on by default
   9
  10 warning: 1 warning emitted
  11