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 `-` | = note: unsigned values cannot be negated help: you may have meant the maximum value of `usize` | LL | let _max: usize = usize::MAX; | ~~~~~~~~~~ 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`.