test_unbuf_channel_post_native
../boost/fiber/unbuffered_channel.hpp:339:40: warning: moving a local object in a return statement prevents copy elision [-Wpessimizing-move]
test_unbuffered_channel_post_asm
../boost/fiber/unbuffered_channel.hpp:339:40: warning: moving a local object in a return statement prevents copy elision [-Wpessimizing-move]