error: implementation of `DistributedIteratorMulti` is not general enough
  --> $DIR/issue-55731.rs:48:5
   |
LL | / trait DistributedIteratorMulti<Source> {
LL | |     type Item;
LL | | }
   | |_- trait `DistributedIteratorMulti` defined here
...
LL |       multi(Map {
   |       ^^^^^ implementation of `DistributedIteratorMulti` is not general enough
   |
   = note: `DistributedIteratorMulti<&'0 ()>` would have to be implemented for the type `Cloned<&()>`, for any lifetime `'0`...
   = note: ...but `DistributedIteratorMulti<&'1 ()>` is actually implemented for the type `Cloned<&'1 ()>`, for some specific lifetime `'1`

error: aborting due to previous error