From: Nikolai Weibull <now@...>
Date: 2012-05-03T13:09:43+09:00
Subject: [ruby-core:44835] Re: [ruby-trunk - Feature #6376][Feedback] Feature lookup and checking if feature is loaded

On Thu, May 3, 2012 at 6:02 AM, mame (Yusuke Endoh) <mame@tsg.ne.jp> wrote:
>
> Issue #6376 has been updated by mame (Yusuke Endoh).
>
> Status changed from Open to Feedback
>
> Of course you know what is defined by the feature you loaded, don't you?
> (If not, you must not load such a file; it is very dangerous)
>
> So you can use: defined?(OpenStruct)

Except that defined? won���t work for paths:

class A
end
class B
end
p defined?(A::B)

so if you have a file that provides A::B and B has already been
provided by another library, then defined? won���t work.