* lib/delegate.rb (marshal_dump/load): Provide forward compatibility [ruby-core:24211]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26195 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 4 deletions

diff --git a/lib/delegate.rb b/lib/delegate.rb
index f8a71f1863..1516dacb15 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -184,16 +184,21 @@ class Delegator
   # Serialization support for the object returned by \_\_getobj\_\_.
   def marshal_dump
     [
+      :__v2__,
       instance_variables,
       instance_variables.map{|var| instance_variable_get(var)},
       __getobj__
     ]
   end
   # Reinitializes delegation from a serialized object.
-  def marshal_load(obj)
-    vars, values, obj = obj
-    vars.each_with_index{|var, i| instance_variable_set(var, values[i])}
-    __setobj__(obj)
+  def marshal_load(data)
+    version, vars, values, obj = data
+    if version == :__v2__
+      vars.each_with_index{|var, i| instance_variable_set(var, values[i])}
+      __setobj__(obj)
+    else
+      __setobj__(data)
+    end
   end
 
   # Clone support for the object returned by \_\_getobj\_\_.