From: Nikolai Weibull <now@...>
Date: 2012-05-03T14:29:20+09:00
Subject: [ruby-core:44842] Re: [ruby-trunk - Feature #6376][Feedback] Feature lookup and checking if feature is loaded

On Thu, May 3, 2012 at 6:53 AM, Yusuke Endoh <mame@tsg.ne.jp> wrote:
> 2012/5/3 Nikolai Weibull <now@bitwi.se>:
>> so if you have a file that provides A::B and B has already been
>> provided by another library, then defined? won���t work.
>
> Then, defined?(A::B.some_class_method) or else.

That���s far from good enough.

> Anyway, I don't think it is a good idea to depend whether a feature is
> "loaded" by require or not.
> What we really need to know is, whether a feature that you need is
> "defined", doesn't it?

Yes, certainly.  Add loaded?/feature? that works like defined? except
that it doesn���t leak its lookup into parent namespaces.