I can't get the stream1.cpp example to compile

https://github.com/cierelabs/cppnow-2017-networking-ts-workshop/blob/master/examples/stream1.cpp

.../networking-ts-impl/include/experimental/__net_ts/detail/consuming_buffers.hpp:-1: In member function 'std::experimental::net::v1::detail::consuming_buffers<Buffer, Buffers, Buffer_Iterator>::prepared_buffers_type std::experimental::net::v1::detail::consuming_buffers<Buffer, Buffers, Buffer_Iterator>::prepare(std::size_t)':

.../networking-ts-impl/include/experimental/__net_ts/detail/consuming_buffers.hpp:107: error: parse error in template argument list
while (next != end && max_size > 0 && result.count < result.max_buffers)
^