rust/tests/compile-fail/identity_op.rs

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#![feature(plugin)]
#![plugin(clippy)]
const ONE : i64 = 1;
const NEG_ONE : i64 = -1;
const ZERO : i64 = 0;
#[deny(identity_op)]
fn main() {
let x = 0;
x + 0; //~ERROR the operation is ineffective
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x + (1 - 1); //~ERROR the operation is ineffective
x + 1;
0 + x; //~ERROR the operation is ineffective
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1 + x;
x - ZERO; //no error, as we skip lookups (for now)
x | (0); //~ERROR the operation is ineffective
((ZERO)) | x; //no error, as we skip lookups (for now)
x * 1; //~ERROR the operation is ineffective
1 * x; //~ERROR the operation is ineffective
x / ONE; //no error, as we skip lookups (for now)
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x / 2; //no false positive
x & NEG_ONE; //no error, as we skip lookups (for now)
-1 & x; //~ERROR the operation is ineffective
}