Can anyone suggest what I need to do to get the new Swift Standard Library to run with Xcode 7 beta on OS 10.10.3 (i.e. _not_ 10.11 beta)?
I consistently get "Unable to find a suitable target device" as soon as I go to a playground page with executable code in it. Prompted by a Stackoverflow suggestion for a previous version of Xcode, I have tried creating an iOS 9 simulator device, but that has not solved the problem. Unlike a full-fledged project, a playground does not seem to have any way of attaching it to a device, real or simulated.