From da2e0721b1ba94e8e786224469fe4bf7550c996a Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 16 Apr 2016 01:00:13 +0000
Subject: struct.c: unique members

* struct.c (struct_make_members_list, rb_struct_s_def): member
  names should be unique. [ruby-core:74971] [Bug #12291]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54612 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_struct.rb | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_struct.rb b/test/ruby/test_struct.rb
index 38632a1981..1223d4b816 100644
--- a/test/ruby/test_struct.rb
+++ b/test/ruby/test_struct.rb
@@ -367,6 +367,13 @@ module TestStruct
     assert_nil(o.dig(:b, 0))
   end
 
+  def test_new_dupilicate
+    bug12291 = '[ruby-core:74971] [Bug #12291]'
+    assert_raise_with_message(ArgumentError, /duplicate member/, bug12291) {
+      @Struct.new(:a, :a)
+    }
+  end
+
   class TopStruct < Test::Unit::TestCase
     include TestStruct
 
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