1 files changed, 11 insertions, 0 deletions
diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 8b95ecedc4..79f7965623 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -1394,6 +1394,17 @@ class TestModule < Test::Unit::TestCase
     assert_match(/: warning: previous definition of foo/, stderr)
   end
 
+  def test_module_function_inside_method
+    assert_warn(/calling module_function without arguments inside a method may not have the intended effect/, '[ruby-core:79751]') do
+      Module.new do
+        def self.foo
+          module_function
+        end
+        foo
+      end
+    end
+  end
+
   def test_protected_singleton_method
     klass = Class.new
     x = klass.new