Roger Pack wrote in post #986564:
> Hello all.
>
> Noticed this behavior:
>
>>> require 'singleton'
> => true
>>> class A; include Singleton; end
> => A
>>> A.instance
> => #<A:0x3703c38>

I looked through the ruby docs and neither Object, Module, Class, nor 
Singelton have a method named 'instance'.  Where does that come from?

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