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bug#29165: 26.0.90; can't use some code byte-compiled under emacs 24


From: Ken Raeburn
Subject: bug#29165: 26.0.90; can't use some code byte-compiled under emacs 24
Date: Mon, 6 Nov 2017 12:25:24 -0500

On Nov 6, 2017, at 09:40, Drew Adams <address@hidden> wrote:

>>>> We should perhaps put something about throwing error on '&option &rest'
>>>> into NEWS though.
>>> 
>>> I don't understand.  In Common Lisp it is perfectly correct
>>> to use both &optional and &rest.
>> 
>> What's rejected is (&optional &rest other-vars), whereas (&optional
>> var1 &rest other-vars) is okay. Does CL accept the first form (and if
>> yes, what does it mean)? I couldn't tell from the page you linked to.
> 
> CL accepts a single variable after &rest. And there must be
> a variable after &optional.  (&optional foo &rest bar) is OK.
> 
> (&optional &rest foo) is not OK.
> (&optional foo &rest bar toto titi) is not OK.

Is this CL in general or a particular CL implementation? The web page you sent 
the URL for earlier reads like a specification, and from its use of “*” looks 
to me like it allows the (admittedly useless) form of &optional with no 
variables.

Ken




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