Fired up Xcode 6 for the first time and excitedly opened a new playground, and I crashed it within 60 seconds by changing the "var" statement in a template to a "let" statement and then back to a "var". Whoops. It kind of reminds me of when I learned that the weight limit for those swings you can buy at Toys R Us is 80 pounds. Edit: And I did it again. It lasted about 3 minutes before simply crashing on me. I can't tell what it is that I'm doing that causes it to crash, although I must say I can crash it swiftly. It looks fairly promising, I just wish it would let me play with it longer before it collapses under its own weight.