frozen-inspect.diff

$ git diff
diff --git a/kernel/common/marshal.rb b/kernel/common/marshal.rb
index 688c24c..9bff937 100644
--- a/kernel/common/marshal.rb
+++ b/kernel/common/marshal.rb
@@ -546,6 +546,10 @@ module Marshal

       call obj if @proc and call_proc

+      if obj.frozen?
+        STDERR.puts 'frozen object: ', obj.inspect, 'stream :', @stream.inspect
+      end
+
       @stream.tainted? ? obj.taint : obj
     end