actually test "x in y" expressions

git-svn-id: http://haxe.googlecode.com/svn/trunk@6070 f16182fa-f095-11de-8f43-4547254af6c6
ObjectMap fixes

git-svn-id: http://haxe.googlecode.com/svn/trunk@6071 f16182fa-f095-11de-8f43-4547254af6c6