src/ZF/Constructible/ROOT.ML

avoid infinite recursion in peephole optimizer function -- this had a debilitating effect on rationals and reals

(*  Title:      ZF/Constructible/ROOT.ML
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   2002  University of Cambridge

Inner Models, Absoluteness and Consistency Proofs.
*)

use_thys ["DPow_absolute", "AC_in_L", "Rank_Separation"];