A tuple struct‘s element isn’t a machine type when using the #[simd]
attribute.
Erroneous code example:
#![feature(repr_simd)] #[repr(simd)] struct Bad(String); // error!
When using the #[simd]
attribute on a tuple struct, the elements in the tuple must be machine types so SIMD operations can be applied to them.
Fixed example:
#![feature(repr_simd)] #[repr(simd)] struct Good(u32, u32, u32); // ok!