{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
                let arg = self.context.new_cast(self.location, arg, self.ulonglong_type);
                let count_leading_zeroes = self.context.get_builtin_function("__builtin_clzll");
                let diff = self.ulonglong_type.get_size() as i64 - arg_type.get_size() as i64;