compiler/rustc_error_codes/src/error_codes/E0497.md

   1 #### Note: this error code is no longer emitted by the compiler.
   2
   3 A stability attribute was used outside of the standard library.
   4
   5 Erroneous code example:
   6
   7 ```compile_fail
   8 #[stable] // error: stability attributes may not be used outside of the
   9           //        standard library
  10 fn foo() {}
  11 ```
  12
  13 It is not possible to use stability attributes outside of the standard library.
  14 Also, for now, it is not possible to write deprecation messages either.