2.2.6 is not compatible with boost-1.70

[yurivict]

In file included from /usr/local/include/boost/asio/executor.hpp:338:
/usr/local/include/boost/asio/impl/executor.hpp:179:22: error: no member named 'context' in 'std::__1::reference_wrapper<boost::asio::io_context>'
    return executor_.context();
           ~~~~~~~~~ ^
/usr/local/include/boost/asio/impl/executor.hpp:142:3: note: in instantiation of member function 'boost::asio::executor::impl<std::__1::reference_wrapper<boost::asio::io_context>, std::__1::allocator<void> >::context' requested here
  impl(const Executor& e, const Allocator& a) BOOST_ASIO_NOEXCEPT
  ^
/usr/local/include/boost/asio/impl/executor.hpp:137:30: note: in instantiation of member function 'boost::asio::executor::impl<std::__1::reference_wrapper<boost::asio::io_context>, std::__1::allocator<void> >::impl' requested here
    impl* p = new (mem.ptr_) impl(e, a);
                             ^

clang-6 on FreeBSD

[kpeeters]

Duplicate of your own https://github.com/kpeeters/cadabra2/issues/139. Unfortunately this is an issue with websocketpp, and updating that caused other problems. Any suggestions are welcome.

[yurivict]

I see, I forgot about this, sorry!

Closing as a duplicate.