src/Pure/thm.ML

--- a/src/Pure/thm.ML	Thu Oct 04 16:09:12 2001 +0200
+++ b/src/Pure/thm.ML	Thu Oct 04 23:27:01 2001 +0200
@@ -358,7 +358,7 @@
 
 fun major_prem_of thm =
   (case prems_of thm of
-    prem :: _ => prem
+    prem :: _ => Logic.strip_assums_concl prem
   | [] => raise THM ("major_prem_of: rule with no premises", 0, [thm]));
 
 fun no_prems thm = nprems_of thm = 0;