Matthew Kerwin wrote in post #1101371:
> On 13 March 2013 20:19, Love U Ruby <lists / ruby-forum.com> wrote:
>
>>
> Only by reading the documentation.  ri is a good start.

Humm, That I know. But I thought if anything like Module#const_defined? 
or Module#class_variable_defined? is there or not. so that I can test 
the same for symbols on my `IRB`.But @Hans confirmed that -  nothing is 
there. So It's Okay. :D

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