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A tuple struct's element isn't a machine type when using the `#[simd]`
attribute.
Erroneous code example:
```compile_fail,E0077
#![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, u32); // ok!
```
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