error[E0080]: attempt to negate `i8::MIN`, which would overflow
  --> $DIR/const-eval-overflow-2.rs:11:25
   |
LL | const NEG_NEG_128: i8 = -NEG_128;
   |                         ^^^^^^^^ evaluation of `NEG_NEG_128` failed here

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0080`.