src/tools/clippy/src/docs/unit_cmp.txt

   1 ### What it does
   2 Checks for comparisons to unit. This includes all binary
   3 comparisons (like `==` and `<`) and asserts.
   4
   5 ### Why is this bad?
   6 Unit is always equal to itself, and thus is just a
   7 clumsily written constant. Mostly this happens when someone accidentally
   8 adds semicolons at the end of the operands.
   9
  10 ### Example
  11 ```
  12 if {
  13     foo();
  14 } == {
  15     bar();
  16 } {
  17     baz();
  18 }
  19 ```
  20 is equal to
  21 ```
  22 {
  23     foo();
  24     bar();
  25     baz();
  26 }
  27 ```
  28
  29 For asserts:
  30 ```
  31 assert_eq!({ foo(); }, { bar(); });
  32 ```
  33 will always succeed