When using the #[simd]
attribute on a tuple struct, the components of the tuple struct must all be of a concrete, nongeneric type so the compiler can reason about how to use SIMD with them. This error will occur if the types are generic.
This will cause an error:
#![feature(repr_simd)] #[repr(simd)] struct Bad<T>(T, T, T);
This will not:
#![feature(repr_simd)] #[repr(simd)] struct Good(u32, u32, u32);