{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"self.binary_op(BinOp::SubWithOverflow,"}]}
                        self.binary_op(BinOp::SubWithOverflow, &a_offset, &b_offset)?
                        let b_offset = ImmTy::from_uint(b_offset, usize_layout);
                            .to_scalar_pair()