warning: use of a double negation
  --> $DIR/lint-double-negations.rs:6:5
   |
LL |     --x;
   |     ^^^
   |
   = note: the prefix `--` could be misinterpreted as a decrement operator which exists in other languages
   = note: use `-= 1` if you meant to decrement the value
   = note: `#[warn(double_negations)]` on by default
help: add parentheses for clarity
   |
LL |     -(-x);
   |      +  +

warning: use of a double negation
  --> $DIR/lint-double-negations.rs:7:6
   |
LL |     ---x;
   |      ^^^
   |
   = note: the prefix `--` could be misinterpreted as a decrement operator which exists in other languages
   = note: use `-= 1` if you meant to decrement the value
help: add parentheses for clarity
   |
LL |     --(-x);
   |       +  +

warning: use of a double negation
  --> $DIR/lint-double-negations.rs:8:14
   |
LL |     let _y = --(-x);
   |              ^^^^^^
   |
   = note: the prefix `--` could be misinterpreted as a decrement operator which exists in other languages
   = note: use `-= 1` if you meant to decrement the value
help: add parentheses for clarity
   |
LL |     let _y = -(-(-x));
   |               +     +

warning: 3 warnings emitted