Check valuables when ClozureCL Debugger launched

Running some functions on ClozureCL, errors are sometime happened and debugger is launched like below.

? (defvar *global* 99999)
*GLOBAL*
? (format t *global*)
> Error: The value 99999 is not of the expected type STRING.
> While executing: ENSURE-SIMPLE-STRING, in process listener(1).
> Type :POP to abort, :R for a list of available restarts.
> Type :? for other options.
1 >

At this point, type :R shows stack trace, I wrote about this in this article. But, there are something can be tried at this time.
I would like to check the valuables when some errors would be happened, maybe not only me. ClozureCL Debugger can help checking the valuables with using some output functions like princ.

1 > (princ *global*)
99999
99999
1 > 

And debugger accepts retry function which is fixed something.

1 > (format t "~A~%" *global*)
99999
NIL
1 > q
?