Index: library/serialize/serializer.tcl
===================================================================
diff -u -r229c28e147436c1585ba9a5911cc48059ef1ed81 -r275da34d3d7a874a451eced58242b738c8a37d1a
--- library/serialize/serializer.tcl	(.../serializer.tcl)	(revision 229c28e147436c1585ba9a5911cc48059ef1ed81)
+++ library/serialize/serializer.tcl	(.../serializer.tcl)	(revision 275da34d3d7a874a451eced58242b738c8a37d1a)
@@ -716,7 +716,7 @@
 
     :method Class-needsNothing {x s} {
       if {![:Object-needsNothing $x $s]} {return 0}
-      set scs [$x info superclass]
+      set scs [$x ::nsf::methods::class::info::superclass]
       if {[$s needsOneOf $scs]} {return 0}
       if {[$s needsOneOf [::nsf::relation::get $x class-mixin]]} {return 0}
       foreach sc $scs {if {[$s needsOneOf [$sc ::nsf::methods::class::info::slotobjects]]} {return 0}}