# HG changeset patch
# User nipkow
# Date 796546457 -7200
# Node ID a29142d703bcb4e8e7619f76a13d7f381527e337
# Parent  f7011b47ac381be1d82e483d0b9f4f9490a55867
Simplification: used Logic.occs instead of mem add_term_frees

diff -r f7011b47ac38 -r a29142d703bc src/Pure/thm.ML
--- a/src/Pure/thm.ML	Tue Mar 28 13:13:17 1995 +0200
+++ b/src/Pure/thm.ML	Thu Mar 30 08:54:17 1995 +0200
@@ -1067,7 +1067,7 @@
 (*simple test for looping rewrite*)
 fun loops sign prems (lhs,rhs) =
   is_Var(lhs) orelse
-  (is_Free(lhs) andalso (lhs mem (foldr add_term_frees (rhs::prems,[])))) orelse
+  (is_Free(lhs) andalso (exists (apl(lhs, Logic.occs)) (rhs::prems))) orelse
   (null(prems) andalso
    Pattern.matches (#tsig(Sign.rep_sg sign)) (lhs,rhs));