| #### Note: this error code is no longer emitted by the compiler | |
| An unknown argument was given to the `instruction_set` attribute. | |
| Erroneous code example: | |
| ```compile_fail | |
| #![feature(isa_attribute)] | |
| #[instruction_set(intel::x64)] // error: invalid argument | |
| pub fn something() {} | |
| fn main() {} | |
| ``` | |
| The `instruction_set` attribute only supports two arguments currently: | |
| * arm::a32 | |
| * arm::t32 | |
| All other arguments given to the `instruction_set` attribute will return this | |
| error. Example: | |
| ``` | |
| #![feature(isa_attribute)] | |
| #[cfg_attr(target_arch="arm", instruction_set(arm::a32))] // ok! | |
| pub fn something() {} | |
| fn main() {} | |
| ``` | |
| For more information see the [`instruction_set` attribute][isa-attribute] | |
| section of the Reference. | |
| [isa-attribute]: https://doc.rust-lang.org/reference/attributes/codegen.html |