An easy way to show the problem is:
! this works
1 T{ circle f "abc" 0 } nth .
! This gives an error about nth not being a method for circle
1 T{ circle f "abc" 0 } nth-unsafe .
! This works if you step-in through the code, but not if you 'continue'
1 T{ circle f "abc" 0 } [ nth-unsafe ] walk
Chris.
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