# Module ::M in a module

**URL:** <https://www.ruby-forum.com/t/module-m-in-a-module/136593>\
**Category:** Development\
**Created:** [May 4, 2008, 4:40am UTC](https://www.ruby-forum.com/t/module-m-in-a-module/136593 "2008-05-04T04:40:56Z")\
**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:** [May 4, 2008, 4:40am UTC](https://www.ruby-forum.com/t/module-m-in-a-module/136593/1 "2008-05-04T04:40:56Z")

</div>

e$B0J2\<$N$h$&$K!"e(Bmodule M2 e$B$NCf$Ke(B module ::M e$B$H=q$$$?;~!"e(B  
:: e$B$OL5;k$5$l$Fe(B M2::M e$B$,Dj5A$5$l$k$h$&$G$9!#e(B

% ./ruby -ve ’  
module M  
def self.m() p :m end  
end  
module M2  
module ::M  
p self  
p Module.nesting  
p self.m  
end  
end  
’  
ruby 1.9.0 (2008-05-02 revision 16277) [i686-linux]  
M2::M  
[M2::M, M2]  
-e:9:in `<module:M>': undefined method`m’ for M2:ⓂModule  
(NoMethodError)  
from -e:6:in `<module:M2>' from -e:5:in`’

1.8 e$B$G$O30B&$Ne(B M e$B$,;2\>H$5$l$^$9!#e(B

% ruby-1.8 -ve ’  
module M  
def self.m() p :m end  
end  
module M2  
module ::M  
p self  
p Module.nesting  
p self.m  
end  
end  
’  
ruby 1.8.7 (2008-05-02 patchlevel 5000) [i686-linux]  
M  
[M, M2]  
:m  
nil

:: e$B$r=q$$$F$b0UL#$,$J$$$H$$$&$N$O4qL/$K;W$&$s$G$9$,!"0U?^E\*e(B  
e$B$G$7$g$&$+e(B?