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From: Glenn Morris <rgm@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [alinsoar@voila.fr: EVAL and partial-completion-mode]
Date: Mon, 05 Mar 2007 17:23:03 -0500
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Cc: rms@gnu.org, emacs-devel@gnu.org
To: Chong Yidong <cyd@stupidchicken.com>
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Chong Yidong wrote:

> Richard Stallman <rms@gnu.org> writes:
>
>> Would someone please fix this, then ack?
>
> I don't think partial-completion-mode has ever worked for this (i.e.,
> completing Lisp symbols in M-:), has it?  It may not be trivial to add
> this functionality.

I think it's just because TAB is bound to lisp-complete-symbol in
M-:, which uses read-expression-map. Enabling recursive minibuffers,
PC-lisp-complete-symbol works as it should in this example.

(define-key read-expression-map "\t" 'PC-lisp-complete-symbol)

would get the desired behaviour.