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-rw-r--r--activesupport/lib/active_support/concern.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/concern.rb b/activesupport/lib/active_support/concern.rb
index 4082d2d464..0403eb70ca 100644
--- a/activesupport/lib/active_support/concern.rb
+++ b/activesupport/lib/active_support/concern.rb
@@ -132,7 +132,7 @@ module ActiveSupport
end
def class_methods(&class_methods_module_definition)
- mod = const_defined?(:ClassMethods) ?
+ mod = const_defined?(:ClassMethods, false) ?
const_get(:ClassMethods) :
const_set(:ClassMethods, Module.new)