error[E0201]: duplicate definitions with name `override_`:
  --> tests/ui/fail_macros_in_impl.rs:4:5
   |
4  |     fn override_(&self) -> String;
   |     ^^----------------------------
   |     |
   |     duplicate definition
   |     item in trait
...
22 |         fn override_(&$self) -> String $body
   |         ------------------------------------ previous definition here
...
26 | #[thin_delegate::derive_delegate]
   | --------------------------------- in this procedural macro expansion
   |
   = note: this error originates in the macro `__thin_delegate__feed_trait_def_of_Hello` which comes from the expansion of the attribute macro `thin_delegate::derive_delegate` (in Nightly builds, run with -Z macro-backtrace for more info)