There's already open issues in GitHub regarding the differences in generator syntax -- I commented in one: https://github.com/facebook/hhvm/issues/1787 https:/

There's already open issues in GitHub regarding the differences in generator syntax -- I commented in one: https://github.com/facebook/hhvm/issues/1787 https://github.com/facebook/hhvm/issues/1787 I guess the class has been renamed in trunk, but according to this, the syntax differences still remain: https://github.com/facebook/hhvm/issues/1871 https://github.com/facebook/hhvm/issues/1871 And while we're at it, might as well point out the missing Closure::bind and Closure::bindTo from PHP 5.4: https://github.com/facebook/hhvm/issues/1203 https://github.com/facebook/hhvm/issues/1203