I forgot to tell this was in COG branch. This file is generated, and the type is inferred from InterpreterProxy>>positive64BitIntegerFor: I guess that a correct returnTypeC:#sqInt annotation is missing here.
2013/12/31 Nicolas Cellier nicolas.cellier.aka.nice@gmail.com
positive64BitIntegerFor return type is declared sqLong, but should be sqInt (it returns an oop).