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:

#[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.

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