tests/ui/lint/lint_map_unit_fn.rs

   1 #![deny(map_unit_fn)]
   2
   3 fn foo(items: &mut Vec<u8>) {
   4     items.sort();
   5 }
   6
   7 fn main() {
   8     let mut x: Vec<Vec<u8>> = vec![vec![0, 2, 1], vec![5, 4, 3]];
   9     x.iter_mut().map(foo);
  10     //~^ ERROR `Iterator::map` call that discard the iterator's values
  11     x.iter_mut().map(|items| {
  12     //~^ ERROR `Iterator::map` call that discard the iterator's values
  13         items.sort();
  14     });
  15     let f = |items: &mut Vec<u8>| {
  16         items.sort();
  17     };
  18     x.iter_mut().map(f);
  19     //~^ ERROR `Iterator::map` call that discard the iterator's values
  20 }