intermediate fix for too eager removal of auxiliary variables
intermediate fix for too eager removal of auxiliary variables

   ?- (1 #==> C) #==> D, D = 1.
   D = 1.

koryonik/swipl-devel,edechter/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,mndrix/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,koryonik/swipl-devel,koryonik/swipl-devel,mndrix/swipl-devel,jn7163/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel,jn7163/swipl-devel,edechter/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel