php/php-langspec — pull request #65 by TazeTSchnitzel (2014-08-11 23:12:35+00:00)
Title: Closure immutability

php.net PHP has closures be immutable. HHVM has them be mutable, but I believe that's a bug, so I filed a bug report with them: https://github.com/facebook/hhvm/issues/3431