| #### Note: this error code is no longer emitted by the compiler. | |
| A stability attribute was used outside of the standard library. | |
| Erroneous code example: | |
| ```compile_fail | |
| #[stable] // error: stability attributes may not be used outside of the | |
| // standard library | |
| fn foo() {} | |
| ``` | |
| It is not possible to use stability attributes outside of the standard library. | |
| Also, for now, it is not possible to write deprecation messages either. |