src/tools/clippy/tests/ui/unnecessary_find_map.rs

   1 #![allow(dead_code)]
   2
   3 fn main() {
   4     let _ = (0..4).find_map(|x| if x > 1 { Some(x) } else { None });
   5     //~^ ERROR: this `.find_map` can be written more simply using `.find`
   6     //~| NOTE: `-D clippy::unnecessary-find-map` implied by `-D warnings`
   7     let _ = (0..4).find_map(|x| {
   8         //~^ ERROR: this `.find_map` can be written more simply using `.find`
   9         if x > 1 {
  10             return Some(x);
  11         };
  12         None
  13     });
  14     let _ = (0..4).find_map(|x| match x {
  15         //~^ ERROR: this `.find_map` can be written more simply using `.find`
  16         0 | 1 => None,
  17         _ => Some(x),
  18     });
  19
  20     let _ = (0..4).find_map(|x| Some(x + 1));
  21     //~^ ERROR: this `.find_map` can be written more simply using `.map(..).next()`
  22
  23     let _ = (0..4).find_map(i32::checked_abs);
  24 }
  25
  26 fn find_map_none_changes_item_type() -> Option<bool> {
  27     "".chars().find_map(|_| None)
  28 }
  29
  30 fn issue11260() {
  31     let y = Some(1);
  32     let _x = std::iter::once(1).find_map(|n| (n > 1).then_some(n));
  33     let _x = std::iter::once(1).find_map(|n| (n > 1).then_some(y)); // different option, so can't be just `.find()`
  34 }