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A unrecognized representation attribute was used.
Erroneous code example:
```compile_fail,E0552
#[repr(D)] // error: unrecognized representation hint
struct MyStruct {
my_field: usize
}
```
You can use a `repr` attribute to tell the compiler how you want a struct or
enum to be laid out in memory.
Make sure you're using one of the supported options:
```
#[repr(C)] // ok!
struct MyStruct {
my_field: usize
}
```
For more information about specifying representations, see the ["Alternative
Representations" section] of the Rustonomicon.
["Alternative Representations" section]: https://doc.rust-lang.org/nomicon/other-reprs.html
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