The Xcode 7 playground cannot run any firmware other than iOS 9. For example, add the available check, the playground goes all misty eyed and innocent asking “Why did you do that?”

Why? You evil thing? Because the second I take out that check, you freak out everywhere:

SpriteStuff.playground:61:23: error: ‘GKGraphNode2D’ is only available on iOS 9.0 or newer
var graphNodes = [GKGraphNode2D]()
^
SpriteStuff.playground:61:23: note: guard with version check
var graphNodes = [GKGraphNode2D]()
^
SpriteStuff.playground:67:16: error: ‘GKPath’ is only available on iOS 9.0 or newer
let path = GKPath(graphNodes: graphNodes, radius: (starNode.position.distanceToPoint(CGPointZero) / 10.0).floatValue)
^

And so forth. Going on for pages.

#available and I are not friends. I think it hates me.

Update:

@ericasadun it's a known bug, and already fixed in beta 2. No more availability checks for latest OS will be required.

— Jack Lawrence (@_jackhl) June 11, 2015