A new feature has been added to the new Bing Webmaster Tools – a robots.txt tester. You can take the tester for a ride over here.
This feature was added by Bing back in 2009, but was dropped. Now, it has officially returned.
What does the Tester do?
According to Bing, it will analyze Webmaster’s robots.txt, highlighting anything preventing them from being optimally crawled by Bing and other robots.