error[E0308]: mismatched types
  --> $DIR/const-eval-overflow-3b.rs:24:22
   |
LL |     = [0; (i8::MAX + 1u8) as usize];
   |                      ^^^ expected i8, found u8

error[E0277]: cannot add `u8` to `i8`
  --> $DIR/const-eval-overflow-3b.rs:24:20
   |
LL |     = [0; (i8::MAX + 1u8) as usize];
   |                    ^ no implementation for `i8 + u8`
   |
   = help: the trait `std::ops::Add<u8>` is not implemented for `i8`

error: aborting due to 2 previous errors

Some errors occurred: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.