Relax overload resolution of any receivers completion functions #1454
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The completion functions of the any_receiver type are currently more strictly constrained than necessary. This PR relaxes them by obeying the rules of overload resolution.
That change enables an
any_receiver<set_value_t(int), set_error_t(std::exception_ptr)>::any_sender<>to be assigned from a sender that hascompletion_signatures<set_value_t(const int&), set_error_t(const std::exception_ptr&)>such as resulting senders from the split algorithm.