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error[E0277]: `<P as Process<'_>>::Item` is not an iterator
  --> $DIR/issue-22872.rs:20:40
   |
LL |     let _: Box<dyn for<'b> Wrap<'b>> = Box::new(Wrapper(process));
   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^ `<P as Process<'_>>::Item` is not an iterator
   |
   = help: the trait `Iterator` is not implemented for `<P as Process<'_>>::Item`
note: required for `Wrapper<P>` to implement `for<'b> Wrap<'b>`
  --> $DIR/issue-22872.rs:7:13
   |
LL | impl<'b, P> Wrap<'b> for Wrapper<P>
   |             ^^^^^^^^     ^^^^^^^^^^
LL | where P: Process<'b>,
LL |       <P as Process<'b>>::Item: Iterator {
   |                                 -------- unsatisfied trait bound introduced here
   = note: required for the cast from `Wrapper<P>` to the object type `dyn for<'b> Wrap<'b>`
help: consider further restricting the associated type
   |
LL | fn push_process<P>(process: P) where P: Process<'static>, <P as Process<'_>>::Item: Iterator {
   |                                                         ++++++++++++++++++++++++++++++++++++

error: aborting due to previous error

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