mirror of https://github.com/rust-lang/rust.git
41 lines
582 B
Rust
41 lines
582 B
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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#![deny(neg_multiply)]
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#![allow(no_effect, unnecessary_operation)]
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use std::ops::Mul;
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struct X;
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impl Mul<isize> for X {
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type Output = X;
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fn mul(self, _r: isize) -> Self {
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self
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}
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}
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impl Mul<X> for isize {
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type Output = X;
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fn mul(self, _r: X) -> X {
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X
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}
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}
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fn main() {
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let x = 0;
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x * -1;
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//~^ ERROR Negation by multiplying with -1
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-1 * x;
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//~^ ERROR Negation by multiplying with -1
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-1 * -1; // should be ok
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X * -1; // should be ok
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-1 * X; // should also be ok
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}
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