Construct a yield context to represent the specified coroutine.

basic_yield_context(
    const detail::weak_ptr< callee_type > & coro,
    caller_type & ca,
    Handler & handler);
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Construct a yield context from another yield context type.

template<
    typename OtherHandler>
basic_yield_context(
    const basic_yield_context< OtherHandler > & other);
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