rust/tests/ui/identity_op.rs

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const ONE: i64 = 1;
const NEG_ONE: i64 = -1;
const ZERO: i64 = 0;
struct A(String);
impl std::ops::Shl<i32> for A {
type Output = A;
fn shl(mut self, other: i32) -> Self {
self.0.push_str(&format!("{}", other));
self
}
}
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#[allow(
clippy::eq_op,
clippy::no_effect,
clippy::unnecessary_operation,
clippy::op_ref,
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clippy::double_parens
)]
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#[warn(clippy::identity_op)]
#[rustfmt::skip]
fn main() {
let x = 0;
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x + 0;
x + (1 - 1);
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x + 1;
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0 + x;
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1 + x;
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x - ZERO; //no error, as we skip lookups (for now)
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x | (0);
((ZERO)) | x; //no error, as we skip lookups (for now)
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x * 1;
1 * x;
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x / ONE; //no error, as we skip lookups (for now)
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x / 2; //no false positive
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x & NEG_ONE; //no error, as we skip lookups (for now)
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-1 & x;
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let u: u8 = 0;
u & 255;
1 << 0; // no error, this case is allowed, see issue 3430
42 << 0;
1 >> 0;
42 >> 0;
&x >> 0;
x >> &0;
let mut a = A("".into());
let b = a << 0; // no error: non-integer
}