anchor.diff:  // 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 = '1.50';
  +const String version = '1.51';
   
   // Restriction on statements and expressions.
   const int stmtDepth = 1;
  
positive.code: const int numGlobalVars = 4;
  const int numLocalVars = 4;
  const int numGlobalMethods = 4;
  const int numClassMethods = 3;
  const int numMethodParams = 4;
  const int numClasses = 4;
  
  
negative.code:     globalMethods =
          fillTypes2(limit2: numGlobalMethods, limit1: numMethodParams);
      classFields = fillTypes2(limit2: numClasses, limit1: numLocalVars);
      final int numClassMethods = 1 + numClasses - classFields.length;
      classMethods = fillTypes3(classFields.length,
          limit2: numClassMethods, limit1: numMethodParams);
  
  