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

   1 #![warn(clippy::map_flatten)]
   2 #![feature(result_flattening)]
   3
   4 // issue #8506, multi-line
   5 #[rustfmt::skip]
   6 fn long_span() {
   7     let _: Option<i32> = Some(1)
   8         .map(|x| {
   9             if x <= 5 {
  10                 Some(x)
  11             } else {
  12                 None
  13             }
  14         })
  15         .flatten();
  16
  17     let _: Result<i32, i32> = Ok(1)
  18         .map(|x| {
  19             if x == 1 {
  20                 Ok(x)
  21             } else {
  22                 Err(0)
  23             }
  24         })
  25         .flatten();
  26
  27     let result: Result<i32, i32> = Ok(2);
  28     fn do_something() { }
  29     let _: Result<i32, i32> = result
  30         .map(|res| {
  31             if res > 0 {
  32                 do_something();
  33                 Ok(res)
  34             } else {
  35                 Err(0)
  36             }
  37         })
  38         .flatten();
  39
  40     let _: Vec<_> = vec![5_i8; 6]
  41         .into_iter()
  42         .map(|some_value| {
  43             if some_value > 3 {
  44                 Some(some_value)
  45             } else {
  46                 None
  47             }
  48         })
  49         .flatten()
  50         .collect();
  51 }
  52
  53 fn main() {
  54     long_span();
  55 }