I don’t have time to review all the context from that talk but I believe there are two issues in play. First, the formatter for NSRect, which should just work. For example, if r is an NSRect local variable: (lldb) p r (NSRect) $0 = (origin = (x = 0, y = 0), size = (width = 0, height = 0))Next, calling NSMakeRect itself, which is tricky because it’s typically inlined. For that you need to import the Cocoa frameworks: (lldb) expr Enter expressions, then terminate with an empty line to evaluate: 1 @import Cocoa; 2 (lldb) p NSMakeRect(0, 0, 10, 10) (NSRect) $0 = (origin = (x = 0, y = 0), size = (width = 10, height = 10))Both of the above were done using Xcode 7.2 or OS X 10.11.2.Share and Enjoy — Quinn “The Eskimo!” Apple Developer Relations, Developer Technical Support, Core OS/Hardware let myEmail = eskimo + 1 + @apple.com