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bug#702: with-help-window returns nil

From: Glenn Morris
Subject: bug#702: with-help-window returns nil
Date: Tue, 12 Aug 2008 12:52:47 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)

Current CVS trunk:

with-help-window returns nil, rather than the last value of BODY.
This causes, eg, describe-function to return nil, rather than the
description. This breaks, eg, eshell/which:

emacs -Q -f eshell
eshell> which which
Wrong type argument: stringp, nil

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