HHVM 4.137 is released! HHVM 4.131–4.136 remain supported, as do the 4.102 and 4.128 LTS releases. HHVM 4.131 remains supported as the 4.132 release was cancelled.


  • hh_client --lint no longer suggests that reified generic parameters should be marked as covariant or contravariant, as this is not supported for reified generic.
  • IDEs now suggest replacing self with static when calling an abstract static method.
  • Improved the accuracy and message clarity of the ‘always false’/’always true’ built in linter when a condition is always true/false due to is/as checks.