Method fix

gecode/int/var-imp/int.hpp:83–86

                             (GECODE_INT_RL2PD(o)^GECODE_INT_RL2PD(n)));
  }
  forceinline void
  IntVarImp::RangeList::fix(RangeList* n) {
    _next = n;
  }

  forceinline void
  IntVarImp::RangeList::min(int n) {