HHVM 4.149 is released! This release marks the end of support of 4.143; 4.144 - 4.148 remain supported, as do the 4.102 and 4.128 LTS releases.


  • __clone is now able to write to its own properties even when the capability set is specified as pure.
  • Add coeffects to the following builtin APIs:
    • class_*
    • dyncall_*_force
    • ReflectionProperty::{get,set}Value
    • Reflection{Method,Property}::setAccessible
    • thrift_protocol_set_compact_version
    • mb_*
  • Fix segment fault when the locale specified in $LANG is not found.