https://git.ruby-lang.org/ruby.git/commit/?id=60f5d38482

From 60f5d384820a4b07f739d32c2233b1dbc74a726a Mon Sep 17 00:00:00 2001
From: Marc-Andre Lafortune <github@m...>
Date: Mon, 14 Sep 2020 15:15:28 -0400
Subject: [ruby/ostruct] Fix dup/clone


diff --git a/lib/ostruct.rb b/lib/ostruct.rb
index f403f63..6f8f255 100644
--- a/lib/ostruct.rb
+++ b/lib/ostruct.rb
@@ -130,10 +130,14 @@ class OpenStruct https://github.com/ruby/ruby/blob/trunk/lib/ostruct.rb#L130
   end
 
   # Duplicates an OpenStruct object's Hash table.
-  def initialize_copy(orig) # :nodoc:
-    orig.table.each_key{|key| new_ostruct_member!(key)}
+  private def initialize_clone(orig) # :nodoc:
+    super # clones the singleton class for us
+    @table = @table.dup unless @table.frozen?
+  end
+
+  private def initialize_dup(orig) # :nodoc:
     super
-    @table = @table.dup
+    initialize(@table)
   end
 
   #
diff --git a/spec/ruby/library/openstruct/frozen_spec.rb b/spec/ruby/library/openstruct/frozen_spec.rb
index 63767bb..c14a4ba 100644
--- a/spec/ruby/library/openstruct/frozen_spec.rb
+++ b/spec/ruby/library/openstruct/frozen_spec.rb
@@ -24,6 +24,7 @@ describe "OpenStruct.new when frozen" do https://github.com/ruby/ruby/blob/trunk/spec/ruby/library/openstruct/frozen_spec.rb#L24
 
   it "creates a frozen clone" do
     f = @os.clone
+    f.frozen?.should == true
     f.age.should == 70
     ->{ f.age = 0 }.should raise_error( RuntimeError )
     ->{ f.state = :newer }.should raise_error( RuntimeError )
@@ -31,6 +32,7 @@ describe "OpenStruct.new when frozen" do https://github.com/ruby/ruby/blob/trunk/spec/ruby/library/openstruct/frozen_spec.rb#L32
 
   it "creates an unfrozen dup" do
     d = @os.dup
+    d.frozen?.should == false
     d.age.should == 70
     d.age = 42
     d.age.should == 42
-- 
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