mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-15 09:27:25 +00:00
4f4abf4e06
Warn about assignments where left-hand side place expression is the same
as right-hand side value expression. For example, warn about assignment in:
```rust
pub struct Event {
id: usize,
x: i32,
y: i32,
}
pub fn copy_position(a: &mut Event, b: &Event) {
a.x = b.x;
a.y = a.y;
}
```
67 lines
1.2 KiB
Rust
67 lines
1.2 KiB
Rust
#![warn(clippy::self_assignment)]
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pub struct S<'a> {
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a: i32,
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b: [i32; 10],
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c: Vec<Vec<i32>>,
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e: &'a mut i32,
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f: &'a mut i32,
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}
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pub fn positives(mut a: usize, b: &mut u32, mut s: S) {
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a = a;
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*b = *b;
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s = s;
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s.a = s.a;
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s.b[10] = s.b[5 + 5];
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s.c[0][1] = s.c[0][1];
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s.b[a] = s.b[a];
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*s.e = *s.e;
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s.b[a + 10] = s.b[10 + a];
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let mut t = (0, 1);
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t.1 = t.1;
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t.0 = (t.0);
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}
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pub fn negatives_not_equal(mut a: usize, b: &mut usize, mut s: S) {
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dbg!(&a);
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a = *b;
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dbg!(&a);
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s.b[1] += s.b[1];
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s.b[1] = s.b[2];
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s.c[1][0] = s.c[0][1];
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s.b[a] = s.b[*b];
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s.b[a + 10] = s.b[a + 11];
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*s.e = *s.f;
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let mut t = (0, 1);
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t.0 = t.1;
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}
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#[allow(clippy::eval_order_dependence)]
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pub fn negatives_side_effects() {
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let mut v = vec![1, 2, 3, 4, 5];
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let mut i = 0;
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v[{
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i += 1;
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i
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}] = v[{
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i += 1;
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i
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}];
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fn next(n: &mut usize) -> usize {
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let v = *n;
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*n += 1;
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v
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}
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let mut w = vec![1, 2, 3, 4, 5];
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let mut i = 0;
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let i = &mut i;
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w[next(i)] = w[next(i)];
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w[next(i)] = w[next(i)];
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}
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fn main() {}
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