src/tools/clippy/tests/ui/manual_filter_map.fixed

   1 // run-rustfix
   2 #![allow(dead_code)]
   3 #![warn(clippy::manual_filter_map)]
   4 #![allow(clippy::redundant_closure)] // FIXME suggestion may have redundant closure
   5
   6 fn main() {
   7     // is_some(), unwrap()
   8     let _ = (0..).filter_map(|a| to_opt(a));
   9
  10     // ref pattern, expect()
  11     let _ = (0..).filter_map(|a| to_opt(a));
  12
  13     // is_ok(), unwrap_or()
  14     let _ = (0..).filter_map(|a| to_res(a).ok());
  15 }
  16
  17 fn no_lint() {
  18     // no shared code
  19     let _ = (0..).filter(|n| *n > 1).map(|n| n + 1);
  20
  21     // very close but different since filter() provides a reference
  22     let _ = (0..).filter(|n| to_opt(n).is_some()).map(|a| to_opt(a).unwrap());
  23
  24     // similar but different
  25     let _ = (0..).filter(|n| to_opt(n).is_some()).map(|n| to_res(n).unwrap());
  26     let _ = (0..)
  27         .filter(|n| to_opt(n).map(|n| n + 1).is_some())
  28         .map(|a| to_opt(a).unwrap());
  29 }
  30
  31 fn to_opt<T>(_: T) -> Option<T> {
  32     unimplemented!()
  33 }
  34
  35 fn to_res<T>(_: T) -> Result<T, ()> {
  36     unimplemented!()
  37 }