1 files changed, 11 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/method_transplanting.rb b/activesupport/lib/active_support/core_ext/module/method_transplanting.rb
new file mode 100644
index 0000000000..b1097cc83b
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/module/method_transplanting.rb
@@ -0,0 +1,11 @@
+class Module
+  ###
+  # TODO: remove this after 1.9 support is dropped
+  def methods_transplantable? # :nodoc:
+    x = Module.new { def foo; end }
+    Module.new { define_method :bar, x.instance_method(:foo) }
+    true
+  rescue TypeError
+    false
+  end
+end