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All types in a tuple struct aren't the same when using the `#[simd]`
attribute.
Erroneous code example:
```compile_fail,E0076
#![feature(repr_simd)]
#[repr(simd)]
struct Bad(u16, u32, u32 u32); // error!
```
When using the `#[simd]` attribute to automatically use SIMD operations in tuple
struct, the types in the struct must all be of the same type, or the compiler
will trigger this error.
Fixed example:
```
#![feature(repr_simd)]
#[repr(simd)]
struct Good(u32, u32, u32, u32); // ok!
```
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