src/test/ui/lint/must-use-ops.rs

   1 // Issue #50124 - Test warning for unused operator expressions
   2
   3 // check-pass
   4
   5 #![warn(unused_must_use)]
   6
   7 fn main() {
   8     let val = 1;
   9     let val_pointer = &val;
  10
  11 // Comparison Operators
  12     val == 1; //~ WARNING unused comparison
  13     val < 1; //~ WARNING unused comparison
  14     val <= 1; //~ WARNING unused comparison
  15     val != 1; //~ WARNING unused comparison
  16     val >= 1; //~ WARNING unused comparison
  17     val > 1; //~ WARNING unused comparison
  18
  19 // Arithmetic Operators
  20     val + 2; //~ WARNING unused arithmetic operation
  21     val - 2; //~ WARNING unused arithmetic operation
  22     val / 2; //~ WARNING unused arithmetic operation
  23     val * 2; //~ WARNING unused arithmetic operation
  24     val % 2; //~ WARNING unused arithmetic operation
  25
  26 // Logical Operators
  27     true && true; //~ WARNING unused logical operation
  28     false || true; //~ WARNING unused logical operation
  29
  30 // Bitwise Operators
  31     5 ^ val; //~ WARNING unused bitwise operation
  32     5 & val; //~ WARNING unused bitwise operation
  33     5 | val; //~ WARNING unused bitwise operation
  34     5 << val; //~ WARNING unused bitwise operation
  35     5 >> val; //~ WARNING unused bitwise operation
  36
  37 // Unary Operators
  38     !val; //~ WARNING unused unary operation
  39     -val; //~ WARNING unused unary operation
  40     *val_pointer; //~ WARNING unused unary operation
  41 }