src/tools/clippy/tests/ui/neg_multiply.rs

   1
   2
   3
   4 #![warn(neg_multiply)]
   5 #![allow(no_effect, unnecessary_operation)]
   6
   7 use std::ops::Mul;
   8
   9 struct X;
  10
  11 impl Mul<isize> for X {
  12     type Output = X;
  13
  14     fn mul(self, _r: isize) -> Self {
  15         self
  16     }
  17 }
  18
  19 impl Mul<X> for isize {
  20     type Output = X;
  21
  22     fn mul(self, _r: X) -> X {
  23         X
  24     }
  25 }
  26
  27 fn main() {
  28     let x = 0;
  29
  30     x * -1;
  31
  32     -1 * x;
  33
  34     -1 * -1; // should be ok
  35
  36     X * -1; // should be ok
  37     -1 * X; // should also be ok
  38 }