{"ast_node_type":"variable","tokens":[{"end":116,"kind":"keyword","start":0,"text":"let"}]}
                let masked = mask & self.context.new_unary_op(self.location, UnaryOp::BitwiseNegate, arg_type, arg);
                let mask = self.context.new_rvalue_from_long(arg_type, -1); // To get the value with all bits set.
                let cond = self.context.new_comparison(self.location, ComparisonOp::Equals, masked, mask);