Support cast in var.

[joeyhub]

If I do var x = (int)(a - b); I get unknown type, cast. It seems to just be hoping for a literal type or something (somehow magically works for function calls though).

Anonymous functions also don't seem to take a return type. Similarly float x = expr gives me strange results like unknown type, list.

[dschissler]

Maybe Zephir needs to borrow a complex operator test kit from another language to see if things should be changed.