LLDB swift print object

Question

Im a little dumfounded with how to use LLDB to inspect an object in a swift project. In this particular case I'm using NSJSONSerializer to serialize a small chunk of JSON and I'd like to inspect the value. In Xcode 5.1 this was super simple, just type "po json" at the lldb prompt and I'd get what I wanted. Now the commands po and print fail me by printing out mostly garbage. I even tried calling the description property because that works with some swift types but that still doesn't work. As a last resort I used an expression with a println statement and finally that works. Surely there must be a better simpler way? Here is the output of LLDB:

(lldb) print json
(AnyObject?) $R4 = (instance_type = Builtin.RawPointer = 0x00007ff05c0c49d0 -> 0x0000000107ef32c8 (void *)0x0000000107ef32f0: __NSCFDictionary)
(lldb) po json
(instance_type = Builtin.RawPointer = 0x00007ff05c0c49d0 -> 0x0000000107ef32c8 (void *)0x0000000107ef32f0: __NSCFDictionary)
 {
 instance_type = 0x00007ff05c0c49d0 -> 0x0000000107ef32c8 (void *)0x0000000107ef32f0: __NSCFDictionary
}
(lldb) print json.description?
error: <EXPR>:1:1: error: 'Optional<AnyObject>' does not have a member named 'description'
json.description?
^ ~~~~~~~~~~~
(lldb) po json.description?
error: <EXPR>:1:1: error: 'Optional<AnyObject>' does not have a member named 'description'
json.description?
^ ~~~~~~~~~~~
(lldb) expression
Enter expressions, then terminate with an empty line to evaluate:
1 println(json)
2 
Optional({
 errors = {
 "authorizations.provider_user_id" = (
 "has already been taken"
 );
 };
})
(lldb) 

Answer 1

you could try

(lldb) expr -O -d run -- json!

The fact that "po" does not exactly work in the same way it does in ObjC is a known limitation. Explicitly unwrapping the optional, and allowing dynamic type resolution on the unwrapped value should work