lib/ostruct.rb 1.12 - wrong commit?

The above mentioned commit makes OpenStructs into singletons, which
again makes it impossible to dump them with Marshal.dump.  This breaks
rpa-base internally.  

Below is the diff in question.  The commit message for lib/ostruct.rb
only mention different files, so it looks like this may be a mistake?

Index: lib/ostruct.rb
===================================================================
RCS file: /home/rubycvs/ruby/lib/ostruct.rb,v
retrieving revision 1.11
retrieving revision 1.12
diff -u -r1.11 -r1.12
--- lib/ostruct.rb	29 Mar 2004 07:54:31 -0000	1.11
+++ lib/ostruct.rb	27 Oct 2004 09:29:24 -0000	1.12
@@ -58,6 +58,13 @@
     @table = @table.dup
   end
 
+  def new_ostruct_member(name)
+    self.instance_eval %{
+      def #{name}; @table[:#{name}]; end
+      def #{name}=(x); @table[:#{name}] = x; end
+    }
+  end
+
   def method_missing(mid, *args) # :nodoc:
     mname = mid.id2name
     len = args.length
@@ -70,6 +77,7 @@
       end
       mname.chop!
       @table[mname.intern] = args[0]
+      self.new_ostruct_member(mname)
     elsif len == 0
       @table[mid]
     else