# HG changeset patch
# User wenzelm
# Date 869225836 -7200
# Node ID d9ca80f0759c7fe17463bf97ddc895ed63920443
# Parent  31186470665fe9fb8bc27fb44d4423445541576d
defs: allow conditions;

diff -r 31186470665f -r d9ca80f0759c src/Pure/drule.ML
--- a/src/Pure/drule.ML	Fri Jul 18 13:36:43 1997 +0200
+++ b/src/Pure/drule.ML	Fri Jul 18 13:37:16 1997 +0200
@@ -119,7 +119,7 @@
   let
     fun err msg = raise_term msg [tm];
 
-    val (lhs, rhs) = Logic.dest_equals tm
+    val (lhs, rhs) = Logic.dest_equals (Logic.strip_imp_concl tm)
       handle TERM _ => err "Not a meta-equality (==)";
     val (head, args) = strip_comb lhs;
     val (c, ty) = dest_Const head