error[E0277]: the trait bound `for<'t> <Map<<&'t _ as IntoIterator>::IntoIter, _> as Iterator>::Item: Foo` is not satisfied
  --> $DIR/issue-60218.rs:18:5
   |
LL | pub fn trigger_error<I, F>(iterable: I, functor: F)
   |        ------------- required by a bound in this
...
LL | for<'t> <Map<<&'t I as IntoIterator>::IntoIter, F> as Iterator>::Item: Foo,
   |                                                                        --- required by this bound in `trigger_error`
...
LL |     trigger_error(vec![], |x: &u32| x)
   |     ^^^^^^^^^^^^^ the trait `for<'t> Foo` is not implemented for `<Map<<&'t _ as IntoIterator>::IntoIter, _> as Iterator>::Item`

error: aborting due to previous error

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