mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-14 17:07:17 +00:00
144 lines
3.6 KiB
Rust
144 lines
3.6 KiB
Rust
#![warn(clippy::manual_split_once)]
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#![allow(unused, clippy::iter_skip_next, clippy::iter_nth_zero)]
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extern crate itertools;
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#[allow(unused_imports)]
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use itertools::Itertools;
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fn main() {
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let _ = "key=value".splitn(2, '=').nth(2);
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let _ = "key=value".split_once('=').unwrap().1;
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let _ = "key=value".split_once('=').unwrap().1;
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let (_, _) = "key=value".split_once('=').unwrap();
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let s = String::from("key=value");
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let _ = s.split_once('=').unwrap().1;
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let s = Box::<str>::from("key=value");
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let _ = s.split_once('=').unwrap().1;
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let s = &"key=value";
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let _ = s.split_once('=').unwrap().1;
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fn _f(s: &str) -> Option<&str> {
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let _ = s.split_once('=')?.1;
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let _ = s.split_once('=')?.1;
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let _ = s.rsplit_once('=')?.0;
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let _ = s.rsplit_once('=')?.0;
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None
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}
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// Don't lint, slices don't have `split_once`
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let _ = [0, 1, 2].splitn(2, |&x| x == 1).nth(1).unwrap();
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// `rsplitn` gives the results in the reverse order of `rsplit_once`
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let _ = "key=value".rsplit_once('=').unwrap().0;
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let (_, _) = "key=value".rsplit_once('=').map(|(x, y)| (y, x)).unwrap();
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let _ = s.rsplit_once('=').map(|x| x.0);
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}
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fn indirect() -> Option<()> {
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let (l, r) = "a.b.c".split_once('.').unwrap();
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let (l, r) = "a.b.c".split_once('.')?;
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let (l, r) = "a.b.c".rsplit_once('.').unwrap();
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let (l, r) = "a.b.c".rsplit_once('.')?;
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// could lint, currently doesn't
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let mut iter = "a.b.c".splitn(2, '.');
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let other = 1;
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let l = iter.next()?;
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let r = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let mut mut_binding = iter.next()?;
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let r = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let tuple = (iter.next()?, iter.next()?);
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// should not lint
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let mut missing_unwrap = "a.b.c".splitn(2, '.');
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let l = missing_unwrap.next();
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let r = missing_unwrap.next();
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let mut mixed_unrap = "a.b.c".splitn(2, '.');
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let unwrap = mixed_unrap.next().unwrap();
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let question_mark = mixed_unrap.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let same_name = iter.next()?;
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let same_name = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let shadows_existing = "d";
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let shadows_existing = iter.next()?;
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let r = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let becomes_shadowed = iter.next()?;
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let becomes_shadowed = "d";
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let r = iter.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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let l = iter.next()?;
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let r = iter.next()?;
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let third_usage = iter.next()?;
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let mut n_three = "a.b.c".splitn(3, '.');
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let l = n_three.next()?;
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let r = n_three.next()?;
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let mut iter = "a.b.c".splitn(2, '.');
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{
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let in_block = iter.next()?;
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}
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let r = iter.next()?;
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let mut lacks_binding = "a.b.c".splitn(2, '.');
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let _ = lacks_binding.next()?;
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let r = lacks_binding.next()?;
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let mut mapped = "a.b.c".splitn(2, '.').map(|_| "~");
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let l = iter.next()?;
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let r = iter.next()?;
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let mut assigned = "";
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let mut iter = "a.b.c".splitn(2, '.');
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let l = iter.next()?;
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assigned = iter.next()?;
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None
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}
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#[clippy::msrv = "1.51"]
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fn _msrv_1_51() {
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// `str::split_once` was stabilized in 1.52. Do not lint this
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let _ = "key=value".splitn(2, '=').nth(1).unwrap();
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let mut iter = "a.b.c".splitn(2, '.');
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let a = iter.next().unwrap();
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let b = iter.next().unwrap();
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}
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#[clippy::msrv = "1.52"]
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fn _msrv_1_52() {
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let _ = "key=value".split_once('=').unwrap().1;
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let (a, b) = "a.b.c".split_once('.').unwrap();
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}
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