error[E0600]: cannot apply unary operator `-` to type `usize`
  --> $DIR/feature-gate-negate-unsigned.rs:10:23
   |
LL |     let _max: usize = -1;
   |                       ^^
   |                       |
   |                       cannot apply unary operator `-`
   |                       help: you may have meant the maximum value of `usize`: `usize::MAX`
   |
   = note: unsigned values cannot be negated

error[E0600]: cannot apply unary operator `-` to type `u8`
  --> $DIR/feature-gate-negate-unsigned.rs:14:14
   |
LL |     let _y = -x;
   |              ^^ cannot apply unary operator `-`
   |
   = note: unsigned values cannot be negated

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0600`.