| 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 |