Tried to get a simple hello-world web page running using Hack and HHVM. Was not successful at all. Runtime installed fine; however, documentation *completely* missed the fact that I needed to install xhp-lib as a dependency if I wanted to use XHP (which was the whole point!), and to do that, I then needed yet another undocumented dependency on something called "composer" (think npm but for PHP).
I wonder if any SV investor would buy my project if it were written in Forth instead...