private static String prepareClosableBlock(GrClosableBlock block) {
    final GrStatement statement = block.getStatements()[0];
    final GrExpression expr;
    if (statement instanceof GrReturnStatement) {
      expr = ((GrReturnStatement)statement).getReturnValue();
    }
    else {
      expr = (GrExpression)statement;
    }
    return prepareExpression(expr);

  }
private static String prepareClosableBlock(GrClosableBlock block)