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'head' specializer for cl-defmethod?

From: Stephen Leake
Subject: 'head' specializer for cl-defmethod?
Date: Tue, 28 Jul 2015 07:06:00 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (windows-nt)

project.el uses a 'head' specializer in the dispatching argument of

This use of 'head' is not documented other than in the 'Added elements'
section of the cl-generic.el header comment.

I'd like to change the cl-defmethod doc
string to say:

    Other than a type, TYPE can also be one of the following:

    - `(eql VAL)' - this method will be invoked when the
      argument is `eql' to VAL.

    - `(head VAL)' - this method will be invoked when the `car' of the
      argument is `eql' to VAL

However, that still leaves out the eieio-core specializer `subclass';
I'm not clear how to handle that in the doc string.

I'm guessing the rationale for supporting the 'head' specializer is to
allow using cl-defmethod with objects that are constructed by `cons',
without any cl-defstruct or eieio defclass. That's how it is used in

Is there a manual section for cl-defmethod? I don't see one in
doc/misc/cl.texi; perhaps we should add one?

-- Stephe

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