rust/tests/ui/mut_mut.rs

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#![allow(unused, clippy::no_effect, clippy::unnecessary_operation)]
#![warn(clippy::mut_mut)]
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fn fun(x: &mut &mut u32) -> bool {
**x > 0
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}
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fn less_fun(x: *mut *mut u32) {
let y = x;
}
macro_rules! mut_ptr {
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($p:expr) => {
&mut $p
};
}
#[allow(unused_mut, unused_variables)]
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fn main() {
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let mut x = &mut &mut 1u32;
{
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let mut y = &mut x;
}
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if fun(x) {
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let y: &mut &mut u32 = &mut &mut 2;
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**y + **x;
}
if fun(x) {
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let y: &mut &mut &mut u32 = &mut &mut &mut 2;
***y + **x;
}
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let mut z = mut_ptr!(&mut 3u32);
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}
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fn issue939() {
let array = [5, 6, 7, 8, 9];
let mut args = array.iter().skip(2);
for &arg in &mut args {
println!("{}", arg);
}
let args = &mut args;
for arg in args {
println!(":{}", arg);
}
}