src/test/rustdoc-ui/error-in-impl-trait/README.md

   1 Each of these needs to be in a separate file,
   2 because the `delay_span_bug` ICE in rustdoc won't be triggerred
   3 if even a single other error was emitted.
   4
   5 However, conceptually they are all testing basically the same thing.
   6 See https://github.com/rust-lang/rust/pull/73566#issuecomment-653689128
   7 for more details.