anchor.diff:      globalVars = fillTypes1();
       globalVars.addAll(DartType.allTypes); // always one each
       globalMethods = fillTypes2();
  -    classFields = fillTypes2();
  +    classFields = fillTypes2(limit: 8);
       classMethods = fillTypes3(classFields.length);
       classParents = <int>[];
       // Setup optional ffi methods and types.
  
positive.code:     return list;
    }
  
    List<List<DartType>> fillTypes2({bool isFfi = false}) {
      final list = <List<DartType>>[];
      for (int i = 0, n = 1 + rand.nextInt(4); i < n; i++) {
        list.add(fillTypes1(isFfi: isFfi));
      }
      return list;
  
negative.code: // Version of DartFuzz. Increase this each time changes are made
  // to preserve the property that a given version of DartFuzz yields
  // the same fuzzed program for a deterministic random seed.
  const String version = '1.36';
  
  // Restriction on statements and expressions.
  const int stmtLength = 2;
  