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+#### 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.