renamed contravariant relator set_rel to vset_rel, to make room for new covariant relator
(* Title: HOL/Quotient_Examples/ROOT.ML
Author: Cezary Kaliszyk and Christian Urban
Testing the quotient package.
*)
use_thys ["DList", "FSet", "Quotient_Int", "Quotient_Message",
"Lift_Set", "Lift_RBT", "Lift_Fun", "Quotient_Rat", "Lift_DList"];