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#### 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);
```
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