| #### 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); | |
| ``` | |
| This will not: | |
| ``` | |
| #![feature(repr_simd)] | |
| #[repr(simd)] | |
| struct Good(u32, u32, u32, u32); | |
| ``` |