# Error code E0497

#### Note: this error code is no longer emitted by the compiler.

A stability attribute was used outside of the standard library.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    #[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.