1 files changed, 10 insertions, 0 deletions
diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index d7d15c7703..ede333fd14 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -124,4 +124,14 @@ class TestISeq < Test::Unit::TestCase
            ISeq.of(c.instance_method(:foobar)).label
     assert_same a, b
   end
+
+  def test_diable_opt
+    src = "a['foo'] = a['bar']; 'a'.freeze"
+    _,_,_,_,_,_,_,_,_,_,_,_,_,body= RubyVM::InstructionSequence.compile(src, __FILE__, __FILE__, __LINE__, false).to_a
+    body.each{|insn|
+      next if Integer === insn
+      op = insn.first
+      assert(!op.to_s.match(/^opt_/), "#{op}")
+    }
+  end
 end