title: Swift: print informative block description
body: <p>While blocks are more comfortable to use rather than named functions, they significantly lack when debugging. I would be very happy if there is a way to get block context info, for example: location in code (file, line), captured variables, arguments etc...</p>
  
  <p>P.S. Description in Xcode Variables panel displays block location, but 'Print description' command prints just <code>Fuction</code> in console</p>