error: implementation of `FnOnce` is not general enough
  --> $DIR/issue-67830.rs:21:66
   |
LL |   fn test() -> impl for<'a> MyFn<&'a A, Output=impl Iterator + 'a> {
   |  __________________________________________________________________^
LL | |
LL | |     Wrap(|a| Some(a).into_iter())
LL | | }
   | |_^ implementation of `FnOnce` is not general enough
   |
   = note: closure with signature `fn(&'2 A) -> std::option::IntoIter<&A>` must implement `FnOnce<(&'1 A,)>`, for any lifetime `'1`...
   = note: ...but it actually implements `FnOnce<(&'2 A,)>`, for some specific lifetime `'2`

error: aborting due to previous error