src/test/ui/impl-trait/issues/issue-70877.min_tait.stderr

   1 error[E0271]: type mismatch resolving `<Bar as Iterator>::Item == Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> Option<String> + 'static)>`
   2   --> $DIR/issue-70877.rs:11:12
   3    |
   4 LL | type FooRet = impl std::fmt::Debug;
   5    |               -------------------- the expected opaque type
   6 ...
   7 LL | type Foo = impl Iterator<Item = FooItem>;
   8    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected opaque type, found enum `Option`
   9    |
  10    = note: expected struct `Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> impl Debug + 'static)>`
  11               found struct `Box<(dyn for<'r> Fn(&'r (dyn ToString + 'r)) -> Option<String> + 'static)>`
  12
  13 error: aborting due to previous error
  14
  15 For more information about this error, try `rustc --explain E0271`.