anchor.diff:              break;
   
             case ONE_STATEMENT:
  -          case IF_STATEMENT:
               addIndented('if (');
               generateNot(node.inputs[0]);
               buffer.add(') ');
  
positive.code:   static final int ONE_STATEMENT = 0;
    static final int ONE_EXPRESSION = 1;
    static final int EMPTY = 2;
    static final int IF_STATEMENT = 3;
    static final int MULTIPLE_STATEMENTS = 4;
  
    /**
     * Returned by [expressionType] to tell how code can be generated for
  
negative.code:         break;
  
        case MULTIPLE_STATEMENTS:
          emitIf();
          visitWithIndent(thenGraph);
  
  