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

   1
   2
   3
   4 const ONE : i64 = 1;
   5 const NEG_ONE : i64 = -1;
   6 const ZERO : i64 = 0;
   7
   8 #[allow(eq_op, no_effect, unnecessary_operation, double_parens)]
   9 #[warn(identity_op)]
  10 fn main() {
  11     let x = 0;
  12
  13     x + 0;
  14     x + (1 - 1);
  15     x + 1;
  16     0 + x;
  17     1 + x;
  18     x - ZERO;     //no error, as we skip lookups (for now)
  19     x | (0);
  20     ((ZERO)) | x; //no error, as we skip lookups (for now)
  21
  22     x * 1;
  23     1 * x;
  24     x / ONE;      //no error, as we skip lookups (for now)
  25
  26     x / 2;        //no false positive
  27
  28     x & NEG_ONE;  //no error, as we skip lookups (for now)
  29     -1 & x;
  30
  31     let u : u8 = 0;
  32     u & 255;
  33 }