error: conflicting representation hints
 --> tests/fail/multi_repr.rs:4:15
  |
4 | #[repr(C, u8, i8)]
  |               ^^

error[E0566]: conflicting representation hints
 --> tests/fail/multi_repr.rs:4:8
  |
4 | #[repr(C, u8, i8)]
  |        ^  ^^  ^^
  |
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
  = note: for more information, see issue #68585 <https://github.com/rust-lang/rust/issues/68585>
  = note: `#[deny(conflicting_repr_hints)]` on by default