tests/ui/map_flatten.fixed

   1 // run-rustfix
   2
   3 #![warn(clippy::all, clippy::pedantic)]
   4 #![allow(clippy::let_underscore_drop)]
   5 #![allow(clippy::missing_docs_in_private_items)]
   6 #![allow(clippy::map_identity)]
   7 #![allow(clippy::redundant_closure)]
   8 #![allow(clippy::unnecessary_wraps)]
   9 #![feature(result_flattening)]
  10
  11 fn main() {
  12     // mapping to Option on Iterator
  13     fn option_id(x: i8) -> Option<i8> {
  14         Some(x)
  15     }
  16     let option_id_ref: fn(i8) -> Option<i8> = option_id;
  17     let option_id_closure = |x| Some(x);
  18     let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id).collect();
  19     let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_ref).collect();
  20     let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_closure).collect();
  21     let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(|x| x.checked_add(1)).collect();
  22
  23     // mapping to Iterator on Iterator
  24     let _: Vec<_> = vec![5_i8; 6].into_iter().flat_map(|x| 0..x).collect();
  25
  26     // mapping to Option on Option
  27     let _: Option<_> = (Some(Some(1))).and_then(|x| x);
  28
  29     // mapping to Result on Result
  30     let _: Result<_, &str> = (Ok(Ok(1))).and_then(|x| x);
  31 }