I'm expecting the following code to print on the Transcript until i
change the inspected Valueholder to hold false.  But nothing at all
shows on the transcript.

| f |
f := ValueHolder new contents: true. f inspect.
[ [ f contents ] whileTrue: 
        [ Transcript show: 'working' ;cr ] ]
        forkAt: Processor userBackgroundPriority.


Can someone explain, or give a snippet that "works"? ( The equivalent
does in VW)

This doesn't have something to do with the discussion about
BlockContexts' temporaries "real vs squeak" I hope?
        
Cheers,
John