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+A stability attribute has been used outside of the standard library.
+
+Erroneous code example:
+
+```compile_fail,E0734
+#[stable(feature = "a", since = "b")] // invalid
+#[unstable(feature = "b", issue = "none")] // invalid
+fn foo(){}
+```
+
+These attributes are meant to only be used by the standard library and are
+rejected in your own crates.