Objective-C Boxed Expressions Error: unexpected '@' in program

According to this article http://clang.llvm.org/docs/ObjectiveCLiterals.html this should be supported starting with clang v3.1
I'm trying to compile some Boxed Expressions with clang 3.1

read the document again.
"Obj-C literals" are supported with clang v3.1, but "boxed expressions" are not.

"Boxed expressions will be available in clang 3.2. It is not currently available in any Apple compiler."

bye, julian

Ha. We should fix that.