real world application: https://github.com/facebook/hhvm/blob/master/hphp/compiler/analysis/type.cpp#L401 https://github.com/facebook/hhvm/blob/master/hphp/comp

real world application: https://github.com/facebook/hhvm/blob/master/hphp/compiler/analysis/type.cpp#L401 https://github.com/facebook/hhvm/blob/master/hphp/compiler/a...