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From: Dmitry Gutov <dgutov@yandex.ru>
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Subject: Re: Generalizing find-definition
Date: Wed, 10 Dec 2014 15:02:23 +0200
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To: Stephen Leake <stephen_leake@stephe-leake.org>
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Stephen Leake <stephen_leake@stephe-leake.org> writes:

> This package does not force anyone to know EIEIO; the package API is all
> plain functions.

The API mandates that `xref-backend-function' returns an instance of a
class derived from xref-backend-class.  How would you implement the
find-func backend without changing xref?

> But people can use the classes if they want to; I intend to in ada-mode.

I don't see why this can't happen with a plain-function implementation.