17 Language support library [language.support]

17.12 Coroutines [support.coroutine]

17.12.4 No-op coroutines [coroutine.noop]

17.12.4.2 Class coroutine_­handle<noop_­coroutine_­promise> [coroutine.handle.noop]

17.12.4.2.3 Promise access [coroutine.handle.noop.promise]

noop_coroutine_promise& promise() const noexcept;
Returns: A reference to the promise object associated with this coroutine handle.