HHVM 4.164 is released! 4.161 - 4.163 remain supported, as do the 4.128 and 4.153 LTS releases.


  • hh now rejects type aliases in catch blocks. These were already banned in the runtime (commit).
  • Fixed an issue with incremental typechecks where making an XHP attribute required would not always show a type error (commit)
  • Introduced the __Docs attribute on classes (commit)