From 71efad1ed391ee0c5398a76306fdbaaadd4dc52e Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Fri, 9 Aug 2019 11:00:34 +0900
Subject: introduce RCLASS_CLONED flag for inline cache.

Methods on duplicated class/module refer same constant inline
cache (IC). Constant access lookup should be done for cloned
class/modules but inline cache doesn't check it.
To check it, this patch introduce new RCLASS_CLONED flag which
are set when if class/module is cloned (both orig and dst).
[Bug #15877]
---
 test/ruby/test_module.rb | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'test/ruby/test_module.rb')

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index cf50db3374..b8d6ffb19d 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -2418,6 +2418,39 @@ class TestModule < Test::Unit::TestCase
     }
   end
 
+  module CloneTestM_simple
+    C = 1
+    def self.m; C; end
+  end
+
+  module CloneTestM0
+    def foo; TEST; end
+  end
+
+  CloneTestM1 = CloneTestM0.clone
+  CloneTestM2 = CloneTestM0.clone
+  module CloneTestM1
+    TEST = :M1
+  end
+  module CloneTestM2
+    TEST = :M2
+  end
+  class CloneTestC1
+    include CloneTestM1
+  end
+  class CloneTestC2
+    include CloneTestM2
+  end
+
+  def test_constant_access_from_method_in_cloned_module
+    m = CloneTestM_simple.dup
+    assert_equal 1, m::C, '[ruby-core:47834]'
+    assert_equal 1, m.m, '[ruby-core:47834]'
+
+    assert_equal :M1, CloneTestC1.new.foo, '[Bug #15877]'
+    assert_equal :M2, CloneTestC2.new.foo, '[Bug #15877]'
+  end
+
   private
 
   def assert_top_method_is_private(method)
-- 
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