error[E0667]: `impl Trait` is not allowed in path parameters
  --> $DIR/impl_trait_projections.rs:21:51
   |
LL | fn projection_is_disallowed(x: impl Iterator) -> <impl Iterator>::Item {
   |                                                   ^^^^^^^^^^^^^

error[E0667]: `impl Trait` is not allowed in path parameters
  --> $DIR/impl_trait_projections.rs:28:9
   |
LL |     -> <impl Iterator as Iterator>::Item
   |         ^^^^^^^^^^^^^

error[E0667]: `impl Trait` is not allowed in path parameters
  --> $DIR/impl_trait_projections.rs:35:27
   |
LL |     -> <::std::ops::Range<impl Debug> as Iterator>::Item
   |                           ^^^^^^^^^^

error[E0667]: `impl Trait` is not allowed in path parameters
  --> $DIR/impl_trait_projections.rs:43:29
   |
LL |     -> <dyn Iterator<Item = impl Debug> as Iterator>::Item
   |                             ^^^^^^^^^^

error[E0223]: ambiguous associated type
  --> $DIR/impl_trait_projections.rs:21:50
   |
LL | fn projection_is_disallowed(x: impl Iterator) -> <impl Iterator>::Item {
   |                                                  ^^^^^^^^^^^^^^^^^^^^^ ambiguous associated type
   |
   = note: specify the type using the syntax `<impl std::iter::Iterator as Trait>::Item`

error[E0277]: the trait bound `impl std::fmt::Debug: std::iter::Step` is not satisfied
  --> $DIR/impl_trait_projections.rs:38:1
   |
LL | / { //~ ERROR trait bound `impl std::fmt::Debug: std::iter::Step` is not satisfied
LL | |     (1i32..100).next().unwrap() //~ ERROR mismatched types
LL | | }
   | |_^ the trait `std::iter::Step` is not implemented for `impl std::fmt::Debug`
   |
   = note: required because of the requirements on the impl of `std::iter::Iterator` for `std::ops::Range<impl std::fmt::Debug>`

error[E0308]: mismatched types
  --> $DIR/impl_trait_projections.rs:39:5
   |
LL |     (1i32..100).next().unwrap() //~ ERROR mismatched types
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected anonymized type, found i32
   |
   = note: expected type `impl std::fmt::Debug`
              found type `i32`

error[E0277]: the trait bound `impl std::fmt::Debug: std::iter::Step` is not satisfied
  --> $DIR/impl_trait_projections.rs:35:8
   |
LL |     -> <::std::ops::Range<impl Debug> as Iterator>::Item
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::iter::Step` is not implemented for `impl std::fmt::Debug`
   |
   = note: required because of the requirements on the impl of `std::iter::Iterator` for `std::ops::Range<impl std::fmt::Debug>`

error: aborting due to 8 previous errors

Some errors occurred: E0223, E0277, E0308, E0667.
For more information about an error, try `rustc --explain E0223`.