https://git.ruby-lang.org/ruby.git/commit/?id=e13f41e02d

From e13f41e02df0d29fbde659b9e426862a8d433003 Mon Sep 17 00:00:00 2001
From: Adam Hess <HParker@g...>
Date: Tue, 5 Jan 2021 15:34:45 -0800
Subject: [ruby/ostruct] Allow ostruct to return a value on super (#4028)

This fixes cases where you can super in something that inherits from OpenStruct

Co-authored-by: John Hawthorn <john@h...>

diff --git a/lib/ostruct.rb b/lib/ostruct.rb
index a5a5140..e7beac0 100644
--- a/lib/ostruct.rb
+++ b/lib/ostruct.rb
@@ -240,6 +240,7 @@ class OpenStruct https://github.com/ruby/ruby/blob/trunk/lib/ostruct.rb#L240
       end
       set_ostruct_member_value!(mname, args[0])
     elsif len == 0
+      @table[mid]
     else
       begin
         super
diff --git a/test/ostruct/test_ostruct.rb b/test/ostruct/test_ostruct.rb
index 3ca98ee..443a20c 100644
--- a/test/ostruct/test_ostruct.rb
+++ b/test/ostruct/test_ostruct.rb
@@ -249,6 +249,14 @@ class TC_OpenStruct < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ostruct/test_ostruct.rb#L249
     assert_equal(:bar, os.format)
   end
 
+  def test_super
+    c = Class.new(OpenStruct) {
+      def foo; super; end
+    }
+    os = c.new(foo: :bar)
+    assert_equal(:bar, os.foo)
+  end
+  
   def test_overridden_public_methods
     os = OpenStruct.new(method: :foo, class: :bar)
     assert_equal(:foo, os.method)
-- 
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