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src/Pure/Thy/export_theory.scala
changeset 73340 0ffcad1f6130
parent 73031 f93f0597f4fb
child 73359 d8a0e996614b 
--- a/src/Pure/Thy/export_theory.scala	Mon Mar 01 20:12:09 2021 +0100
+++ b/src/Pure/Thy/export_theory.scala	Mon Mar 01 22:22:12 2021 +0100
@@ -405,7 +405,7 @@
     var seen = Set.empty[Long]
     var result = SortedMap.empty[Long, (Thm_Id, Proof)]
 
-    def boxes(context: Option[(Long, Term.Proof)], prf: Term.Proof)
+    def boxes(context: Option[(Long, Term.Proof)], prf: Term.Proof): Unit =
     {
       prf match {
         case Term.Abst(_, _, p) => boxes(context, p)
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