Multiple ChoiceHard 45s
co_await Customization Point Lookup
Which lookup is used to find operator co_await for an awaitable expression `e` in a coroutine?
Options
- 1Always argument-dependent lookup on the type of e, exactly as the expression is written
- 2Member operator co_await first, then non-member operator co_await found by ADL, otherwise e itself
- 3Only the std::operator co_await specializations declared for standard awaitable types
- 4Global namespace lookup that ignores argument-dependent lookup for the awaitable type
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