| An unsupported naked function definition. |
| |
| Erroneous code example: |
| |
| ```compile_fail,E0787 |
| #[unsafe(naked)] |
| pub extern "C" fn f() -> u32 { |
| 42 |
| } |
| ``` |
| |
| The naked function must be defined using a single `naked_asm!` assembly block. |
| |
| The execution must never fall through past the end of the assembly |
| code, so it must either return or diverge. The asm block can also |
| use `att_syntax` and `raw` options, but others options are not allowed. |
| |
| The asm block must not contain any operands other than `const` and |
| `sym`. |
| |
| ### Additional information |
| |
| For more information, please see [RFC 2972]. |
| |
| [RFC 2972]: https://github.com/rust-lang/rfcs/blob/master/text/2972-constrained-naked.md |
