co_composed.hpp: Guard use of async_operation #1556
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`async_operation` is defined only when concepts are in use. When ASIO_DISABLE_CONCEPTS is defined, bare `typename` should be used instead. We can't use ASIO_ASYNC_OPERATION macros here, as it currently does not have a no-argument form. Fixes: chriskohlhoff#1547
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async_operationis defined only when concepts are in use. When ASIO_DISABLE_CONCEPTS is defined, baretypenameshould be used instead.We can't use ASIO_ASYNC_OPERATION macros here, as it currently does not have a no-argument form.
Fixes: #1547