Both iOS 8 and OS X Yosemite were clearly the focus of Apple’s WWDC keynote, but one of the biggest surprise announcements was the reveal of Swift, a new programming language for developers. One of the language’s most noteworthy features, the playground, allows developers to test their code as they type, but without a “sandbox” to protect the computer, this can lead to some very unfortunate accidents.

As developer Steve Stroughton-Smith (@stroughtonsmith) warned his followers on Twitter:

You don’t even have to hit enter for the command to take effect. If you were to type that in a Swift playground, the deletion would be automatic. This is obviously a huge liability for any developers giving the brand new programming language a whirl this week, so it’s worth being extra careful if you’re one of them.

Also worth keeping in mind: don’t click any suspicious playground links you find on the web. As noted, if a dangerous line of code enters the playground, you won’t have to time to stop it. We’ll keep an eye out to see what Apple has to say about the vulnerability.

Jacob started covering video games and technology in college as a hobby, but it quickly became clear to him that this was what he wanted to do for a living. He currently resides in New York writing for BGR. His previously published work can be found on TechHive, VentureBeat and Game Rant.