src/test/rustdoc-ui/tuple-variadic-check.stderr

   1 error: `#[doc(fake_variadic)]` must be used on the first of a set of tuple or fn pointer trait impls with varying arity
   2   --> $DIR/tuple-variadic-check.rs:12:7
   3    |
   4 LL | #[doc(fake_variadic)]
   5    |       ^^^^^^^^^^^^^
   6
   7 error: aborting due to previous error
   8