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src/Pure/Isar/proof.ML
changeset 28375 c879d88d038a
parent 28289 efd53393412b
child 28410 927e603def1f 
--- a/src/Pure/Isar/proof.ML	Fri Sep 26 17:24:15 2008 +0200
+++ b/src/Pure/Isar/proof.ML	Fri Sep 26 19:07:56 2008 +0200
@@ -342,7 +342,7 @@
       | subgoals n = string_of_int n ^ " subgoals";
 
     fun description strs =
-      (case filter_out (equal "") strs of [] => ""
+      (case filter_out (fn s => s = "") strs of [] => ""
       | strs' => enclose " (" ")" (commas strs'));
 
     fun prt_goal (SOME (ctxt, (i,
isabelle