error[E0308]: mismatched types
  --> $DIR/const-eval-overflow-4b.rs:9:30
   |
LL |     : [u32; (i8::MAX as i8 + 1u8) as usize]
   |                              ^^^ expected `i8`, found `u8`

error[E0277]: cannot add `u8` to `i8` in const contexts
  --> $DIR/const-eval-overflow-4b.rs:9:28
   |
LL |     : [u32; (i8::MAX as i8 + 1u8) as usize]
   |                            ^ no implementation for `i8 + u8`
   |
   = help: the trait `~const Add<u8>` is not implemented for `i8`
   = help: the following other types implement trait `Add<Rhs>`:
             <&'a f32 as Add<f32>>
             <&'a f64 as Add<f64>>
             <&'a i128 as Add<i128>>
             <&'a i16 as Add<i16>>
             <&'a i32 as Add<i32>>
             <&'a i64 as Add<i64>>
             <&'a i8 as Add<i8>>
             <&'a isize as Add<isize>>
           and 48 others

error[E0604]: only `u8` can be cast as `char`, not `i8`
  --> $DIR/const-eval-overflow-4b.rs:22:13
   |
LL |     : [u32; 5i8 as char as usize]
   |             ^^^^^^^^^^^ invalid cast
   |
help: try casting from `u8` instead
  --> $DIR/const-eval-overflow-4b.rs:22:13
   |
LL |     : [u32; 5i8 as char as usize]
   |             ^^^^^^^^^^^

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0277, E0308, E0604.
For more information about an error, try `rustc --explain E0277`.