Error code E0074

Note: this error code is no longer emitted by the compiler.

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, T);
Run

This will not:

#![feature(repr_simd)]

#[repr(simd)]
struct Good(u32, u32, u32, u32);
Run

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