error[E0277]: `<impl Iterator as Iterator>::Item` doesn't implement `Debug`
  --> $DIR/impl-trait-with-missing-bounds.rs:6:13
   |
LL |         qux(constraint);
   |             ^^^^^^^^^^ `<impl Iterator as Iterator>::Item` cannot be formatted using `{:?}` because it doesn't implement `Debug`
...
LL | fn qux(_: impl std::fmt::Debug) {}
   |                --------------- required by this bound in `qux`
   |
   = help: the trait `Debug` is not implemented for `<impl Iterator as Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
   |
LL | fn foo<I: Iterator>(constraints: I) where <I as Iterator>::Item: Debug {
   |       ^^^^^^^^^^^^^              ^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: `<impl Iterator as Iterator>::Item` doesn't implement `Debug`
  --> $DIR/impl-trait-with-missing-bounds.rs:14:13
   |
LL |         qux(constraint);
   |             ^^^^^^^^^^ `<impl Iterator as Iterator>::Item` cannot be formatted using `{:?}` because it doesn't implement `Debug`
...
LL | fn qux(_: impl std::fmt::Debug) {}
   |                --------------- required by this bound in `qux`
   |
   = help: the trait `Debug` is not implemented for `<impl Iterator as Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
   |
LL | fn bar<T, I: Iterator>(t: T, constraints: I) where T: std::fmt::Debug, <I as Iterator>::Item: Debug {
   |         ^^^^^^^^^^^^^                     ^                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: `<impl Iterator as Iterator>::Item` doesn't implement `Debug`
  --> $DIR/impl-trait-with-missing-bounds.rs:22:13
   |
LL |         qux(constraint);
   |             ^^^^^^^^^^ `<impl Iterator as Iterator>::Item` cannot be formatted using `{:?}` because it doesn't implement `Debug`
...
LL | fn qux(_: impl std::fmt::Debug) {}
   |                --------------- required by this bound in `qux`
   |
   = help: the trait `Debug` is not implemented for `<impl Iterator as Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
   |
LL | fn baz<I: Iterator>(t: impl std::fmt::Debug, constraints: I) where <I as Iterator>::Item: Debug {
   |       ^^^^^^^^^^^^^                                       ^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: `<impl Iterator as Iterator>::Item` doesn't implement `Debug`
  --> $DIR/impl-trait-with-missing-bounds.rs:30:13
   |
LL |         qux(constraint);
   |             ^^^^^^^^^^ `<impl Iterator as Iterator>::Item` cannot be formatted using `{:?}` because it doesn't implement `Debug`
...
LL | fn qux(_: impl std::fmt::Debug) {}
   |                --------------- required by this bound in `qux`
   |
   = help: the trait `Debug` is not implemented for `<impl Iterator as Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
   |
LL | fn bat<I, T: std::fmt::Debug, U: Iterator>(t: T, constraints: U, _: I) where <U as Iterator>::Item: Debug {
   |                             ^^^^^^^^^^^^^                     ^        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: `<impl Iterator + std::fmt::Debug as Iterator>::Item` doesn't implement `Debug`
  --> $DIR/impl-trait-with-missing-bounds.rs:37:13
   |
LL |         qux(constraint);
   |             ^^^^^^^^^^ `<impl Iterator + std::fmt::Debug as Iterator>::Item` cannot be formatted using `{:?}` because it doesn't implement `Debug`
...
LL | fn qux(_: impl std::fmt::Debug) {}
   |                --------------- required by this bound in `qux`
   |
   = help: the trait `Debug` is not implemented for `<impl Iterator + std::fmt::Debug as Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
   |
LL | fn bak<I: Iterator + std::fmt::Debug>(constraints: I) where <I as Iterator>::Item: Debug {
   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^              ^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: `<impl Iterator as Iterator>::Item` doesn't implement `Debug`
  --> $DIR/impl-trait-with-missing-bounds.rs:45:13
   |
LL |         qux(constraint);
   |             ^^^^^^^^^^ `<impl Iterator as Iterator>::Item` cannot be formatted using `{:?}` because it doesn't implement `Debug`
...
LL | fn qux(_: impl std::fmt::Debug) {}
   |                --------------- required by this bound in `qux`
   |
   = help: the trait `Debug` is not implemented for `<impl Iterator as Iterator>::Item`
help: introduce a type parameter with a trait bound instead of using `impl Trait`
   |
LL | fn baw<I: Iterator>(constraints: I) where <I as Iterator>::Item: Debug {
   |       ^^^^^^^^^^^^^              ^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0277`.