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A `#[simd]` attribute was applied to an empty or multi-field struct.
Erroneous code examples:
```compile_fail,E0075
#![feature(repr_simd)]
#[repr(simd)]
struct Bad; // error!
```
```compile_fail,E0075
#![feature(repr_simd)]
#[repr(simd)]
struct Bad([u32; 1], [u32; 1]); // error!
```
The `#[simd]` attribute can only be applied to a single-field struct, because
the one field must be the array of values in the vector.
Fixed example:
```
#![feature(repr_simd)]
#[repr(simd)]
struct Good([u32; 2]); // ok!
```
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