warning[E0566]: conflicting representation hints
  --> $DIR/issue-39720.rs:18:8
   |
LL | #[repr(C)]
   |        ^
LL | #[repr(simd)]
   |        ^^^^

warning[E0566]: conflicting representation hints
  --> $DIR/issue-39720.rs:23:8
   |
LL | #[repr(C)]
   |        ^
LL | #[repr(simd)]
   |        ^^^^