anchor.diff:  
     // Emit a simple increasing for-loop.
     bool emitFor(int depth) {
  -    int i = localVars.length;
  +    final int i = localVars.length;
       emitLn('for (int $localName$i = 0; $localName$i < ', newline: false);
       emitSmallPositiveInt();
       emit('; $localName$i++) {', newline: true);
  
positive.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 = '1.20';
  
  // Restriction on statements and expressions.
  const int stmtLength = 2;
  
negative.code:         return emitScope(depth);
        case 12:
          return emitTryCatch(depth);
        case 13:
          return emitForEach(depth);
        default:
          return emitAssign();
      }
  