1 files changed, 30 insertions, 0 deletions
diff --git a/test/ruby/test_struct.rb b/test/ruby/test_struct.rb
index b6a77a9fb7..49dcdb45b2 100644
--- a/test/ruby/test_struct.rb
+++ b/test/ruby/test_struct.rb
@@ -1,4 +1,5 @@
 require 'test/unit'
+require 'timeout'
 
 class TestStruct < Test::Unit::TestCase
   def test_struct
@@ -219,4 +220,33 @@ class TestStruct < Test::Unit::TestCase
     a = struct_test.new(42)
     assert_equal("#<struct Struct::R\u{e9}sum\u{e9} r\u{e9}sum\u{e9}=42>", a.inspect, '[ruby-core:24849]')
   end
+
+  def test_comparison_when_recursive
+    klass1 = Struct.new(:a, :b, :c)
+
+    x = klass1.new(1, 2, nil); x.c = x
+    y = klass1.new(1, 2, nil); y.c = y
+    Timeout.timeout(1) {
+      assert x == y
+      assert x.eql? y
+    }
+
+    z = klass1.new(:something, :other, nil); z.c = z
+    Timeout.timeout(1) {
+      assert x != z
+      assert !x.eql?(z)
+    }
+
+    x.c = y; y.c = x
+    Timeout.timeout(1) {
+      assert x == y
+      assert x.eql?(y)
+    }
+
+    x.c = z; z.c = x
+    Timeout.timeout(1) {
+      assert x != z
+      assert !x.eql?(z)
+    }
+  end
 end