How does one try out these work in progress features? I tried compiling the example on godbolt.org with gcc-trunk and wasn't sure how to get it working. https:

How does one try out these work in progress features? I tried compiling the example on godbolt.org with gcc-trunk and wasn't sure how to get it working. https://godbolt.org/z/YSPXLu https://godbolt.org/z/YSPXLu