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The type of the field in a tuple struct isn't an array when using the `#[simd]`
attribute.
Erroneous code example:
```compile_fail,E0076
#![feature(repr_simd)]
#[repr(simd)]
struct Bad(u16); // error!
```
When using the `#[simd]` attribute to automatically use SIMD operations in tuple
structs, if you want a single-lane vector then the field must be a 1-element
array, or the compiler will trigger this error.
Fixed example:
```
#![feature(repr_simd)]
#[repr(simd)]
struct Good([u16; 1]); // ok!
```
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