| 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://rust-lang.github.io/rfcs/2972-constrained-naked.html |