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

   1 // run-rustfix
   2
   3 #![feature(custom_inner_attributes)]
   4 #![warn(clippy::manual_split_once)]
   5 #![allow(clippy::iter_skip_next, clippy::iter_nth_zero)]
   6
   7 extern crate itertools;
   8
   9 #[allow(unused_imports)]
  10 use itertools::Itertools;
  11
  12 fn main() {
  13     let _ = Some("key=value".split_once('=').map_or("key=value", |x| x.0));
  14     let _ = "key=value".splitn(2, '=').nth(2);
  15     let _ = "key=value".split_once('=').map_or("key=value", |x| x.0);
  16     let _ = "key=value".split_once('=').map_or("key=value", |x| x.0);
  17     let _ = "key=value".split_once('=').unwrap().1;
  18     let _ = "key=value".split_once('=').unwrap().1;
  19     let (_, _) = "key=value".split_once('=').unwrap();
  20
  21     let s = String::from("key=value");
  22     let _ = s.split_once('=').map_or(&*s, |x| x.0);
  23
  24     let s = Box::<str>::from("key=value");
  25     let _ = s.split_once('=').map_or(&*s, |x| x.0);
  26
  27     let s = &"key=value";
  28     let _ = s.split_once('=').map_or(*s, |x| x.0);
  29
  30     fn _f(s: &str) -> Option<&str> {
  31         let _ = s.split_once("key=value").map_or(s, |x| x.0);
  32         let _ = s.split_once("key=value")?.1;
  33         let _ = s.split_once("key=value")?.1;
  34         None
  35     }
  36
  37     // Don't lint, slices don't have `split_once`
  38     let _ = [0, 1, 2].splitn(2, |&x| x == 1).nth(1).unwrap();
  39
  40     // `rsplitn` gives the results in the reverse order of `rsplit_once`
  41     let _ = "key=value".rsplit_once('=').unwrap().1;
  42     let _ = "key=value".rsplit_once('=').map_or("key=value", |x| x.0);
  43     let _ = "key=value".rsplit_once('=').map(|x| x.1);
  44     let (_, _) = "key=value".rsplit_once('=').map(|(x, y)| (y, x)).unwrap();
  45 }
  46
  47 fn _msrv_1_51() {
  48     #![clippy::msrv = "1.51"]
  49     // `str::split_once` was stabilized in 1.16. Do not lint this
  50     let _ = "key=value".splitn(2, '=').nth(1).unwrap();
  51 }
  52
  53 fn _msrv_1_52() {
  54     #![clippy::msrv = "1.52"]
  55     let _ = "key=value".split_once('=').unwrap().1;
  56 }