title: Swift playground with debugger support?
body: <p>Swift playgrounds in Xcode 7 don't seem to support usage of the debugger.  This features seems like it would be (extremely) useful ...  </p>
  
  <p>I've got a playground that exercises code within a framework I'm writing.  I'd <em>really</em> love to be able to set a breakpoint on the code within my framework -- and have the debugger stop execution when the breakpoint is hit when the code is executed from a playground.  Does anyone know why playgrounds don't currently support this?  Is there some fundamental reason why a playground couldn't support this or might this be a feature that could come in the future?</p>