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src/Pure/Isar/class_declaration.ML
changeset 54883 dd04a8b654fc
parent 54882 61276a7fc369
child 56921 5bf71b4da706 
--- a/src/Pure/Isar/class_declaration.ML	Tue Dec 31 11:19:14 2013 +0100
+++ b/src/Pure/Isar/class_declaration.ML	Tue Dec 31 14:29:16 2013 +0100
@@ -60,7 +60,7 @@
         val tac = loc_intro_tac
           THEN ALLGOALS (Proof_Context.fact_tac empty_ctxt (sup_axioms @ the_list assm_axiom));
       in Element.prove_witness empty_ctxt prop tac end) some_prop;
-    val some_axiom = Option.map Element.conclude_witness some_witn;
+    val some_axiom = Option.map (Element.conclude_witness empty_ctxt) some_witn;
 
     (* canonical interpretation *)
     val base_morph = inst_morph
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