[Jgeneral] Looks like a bug in trace

[Roger Stokes]

NB. trace can produce an incorrect result.
   
   require 'trace'
   
   a =: 6
   trace '(a=:7) ,  a'
 --------------- 7 Is ---------
 a
 =:
 7
 7
 --------------- 8 Paren ------
 (
 7
 )
 7
 --------------- 2 Dyad -------
 7
 ,
 7
 7 7
 ==============================
7 7
   
   NB. the correct result is shown by:
   
   a =: 6
   (a=:7) , a
7 6
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