src/librustc_error_codes/error_codes/E0701.md

   1 This error indicates that a `#[non_exhaustive]` attribute was incorrectly placed
   2 on something other than a struct or enum.
   3
   4 Examples of erroneous code:
   5
   6 ```compile_fail,E0701
   7 #[non_exhaustive]
   8 trait Foo { }
   9 ```