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From: Hrvoje Niksic <hniksic@iskon.hr>
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Subject: Re: CVS: Symbol's function definition is void: ignore-errors
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Dave Love <d.love@dl.ac.uk> writes:

> I've sent Lars a bunch of diffs to fix such problems introduced by
> requiring cl only at compile time, per Emacs standards.  `copy-list'
> and `delete-duplicates' may also bite.

It would be really nice if GNU Emacs standards could change to at
least allow the major packages to use the CL extensions.

Of course, the code can be written without use of copy-list,
delete-duplicates, etc., but some of the functions provided by cl.el
are non-trivial, and it's a shame to have to duplicate the work that
went into implementing them.