anchor.diff:      });
   
       test.test("[~/] B", () {
  -
         {
           BigInt v1 = new BigInt.fromInt(0x8, 4);
           BigInt v2 = new BigInt.fromInt(0x2, 4);
  
positive.code:       }
      });
  
    });
  }
  
negative.code: 
  main() {
    test.group("bigint", () {
      test.test("[+]", () {
        {
          BigInt v1 = new BigInt.fromInt(0xf, 4);
  