The topic might sound a bit extreme, but I believe it’s true.
I enabled HHVM on Tavis CI for the sake of doing a quick test. The result were errors in unit, functional and behat tests:
Some of that looks like things HHVM (and the compile step involved) related to “generated code”. With dynamic classes being even more attractive with PHP7, we should not target HHVM anymore. The speed gain HHVM promised is delivered by PHP7 and we have that working by now.