Proposed resolution:

This wording is relative to N5008.

1. Modify [exec.when.all] as indicated:

   -7- The member impls-for<when_all_t>::get-state is initialized with a callable object equivalent to the following lambda expression:

   []<class Sndr, class Rcvr>(Sndr&& sndr, Rcvr& rcvr) noexcept(noexcept(e)) -> decltype(e) {
     return e;
   }