# Singleton class extended by a module with module\_function

**URL:** <https://www.ruby-forum.com/t/singleton-class-extended-by-a-module-with-module-function/131559>\
**Category:** Development\
**Created:** [March 11, 2008, 11:42am UTC](https://www.ruby-forum.com/t/singleton-class-extended-by-a-module-with-module-function/131559 "2008-03-11T11:42:04Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [March 11, 2008, 11:42am UTC](https://www.ruby-forum.com/t/singleton-class-extended-by-a-module-with-module-function/131559/1 "2008-03-11T11:42:04Z")

</div>

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% cat z.rb  
module M  
module\_function  
def m  
p :m  
end  
end

class C  
end

class \<\< C  
include M  
end

C.m  
% ruby -v z.rb  
ruby 1.9.0 (2008-03-11 revision 15748) [i686-linux]  
:m  
% ruby-1.8 -v z.rb  
ruby 1.8.6 (2008-03-11 patchlevel 5000) [i686-linux]  
z.rb:15: private method `m’ called for C:Class (NoMethodError)

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