diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index acacea9362..35aa16063d 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -1649,6 +1649,71 @@ class TestProc < Test::Unit::TestCase
     assert_equal(20, b.eval("b"))
   end
 
+  def test_numparam_is_not_local_variables
+    "foo".tap do
+      _9
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:_9) }
+      assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+      "bar".tap do
+        assert_equal([], binding.local_variables)
+        assert_raise(NameError) { binding.local_variable_get(:_9) }
+        assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+      end
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:_9) }
+      assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+    end
+
+    "foo".tap do
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:_9) }
+      assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+      "bar".tap do
+        _9
+        assert_equal([], binding.local_variables)
+        assert_raise(NameError) { binding.local_variable_get(:_9) }
+        assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+      end
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:_9) }
+      assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+    end
+  end
+
+  def test_it_is_not_local_variable
+    "foo".tap do
+      it
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:it) }
+      "bar".tap do
+        assert_equal([], binding.local_variables)
+        assert_raise(NameError) { binding.local_variable_get(:it) }
+      end
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:it) }
+      "bar".tap do
+        it
+        assert_equal([], binding.local_variables)
+        assert_raise(NameError) { binding.local_variable_get(:it) }
+      end
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:it) }
+    end
+
+    "foo".tap do
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:it) }
+      "bar".tap do
+        it
+        assert_equal([], binding.local_variables)
+        assert_raise(NameError) { binding.local_variable_get(:it) }
+      end
+      assert_equal([], binding.local_variables)
+      assert_raise(NameError) { binding.local_variable_get(:it) }
+    end
+  end
+
   def test_local_variable_set_wb
     assert_ruby_status([], <<-'end;', '[Bug #13605]', timeout: 30)
       b = binding