- update to 1.28:
* Added missing handler tracking source location support to
awaitable<>-based coroutine's ability to co_await asynchronous
operations packaged as function objects.
* Add missing handler tracking source location support to
co_composed.
* Fixed suppression of spurious 'potential null dereference'
warnings, to work with older compilers.
* Fixed a bug where passing the deprecated const_buffers_1 and
mutable_buffers_1 types to asio::buffer() would result in the
contiguous iterator overloads being incorrectly chosen.
* Fixed compatibility between buffered stream wrappers and
move-constructible streams, such as ssl::stream<>.
* Marked ip::address_v4::to_ulong as deprecated in the documentation.
* Fixed shadowed variable warnings.
* Fixed basic_socket_acceptor::async_accept concept requirement
checking to be compatible with lambdas that have a deduced return
type.
* Fixed a feature detection macro used in use_future's compatibility
traits.
* Fixed as_tuple compatibility with legacy completion tokens.
* Fixed redirect_error compatibility with new completion tokens.
* Fixed a potential, Windows-specific program termination due to
exceptions that should have been allowed to escape from a destructor.
* Fixed this_coro to prevent inadvertent co_await of boolean
expressions.
* Fixed result handling in experimental::use_coro implementation.
* Fixed variadic template emulation for is_async_operation and
completion_signature_of.
* Fixed incorrect reuse of a moved-from result in experimental::promise.