CLISP CLOS style warnings

[Sam Steingold]

> * Faré <snuerr at tznvy.pbz> [2017-08-01 10:07:33 -0400]:
>
>> To mark a generic function as user-extendable, one can now use a
>> declaration:
>>
>> --8<---------------cut here---------------start------------->8---
>> (defgeneric perform (...)
>>   (declare #+clisp (dynamically-modifiable))
>>   ...)
>> (defgeneric operation-done-p (...)
>>   (declare #+clisp (dynamically-modifiable))
>>   ...)
>> --8<---------------cut here---------------end--------------->8---
>>
>> The declaration is now in `hg tip` (but has not been released yet).
>>
> Will that declaration cause a warning or error on older versions of
> clisp? If yes, what read-time conditional more precise than #+clisp
> can I use to only enable on recent enough versions of clisp?

My first reaction was

--8<---------------cut here---------------start------------->8---
(declaim (declaration dynamically-modifiable))
--8<---------------cut here---------------end--------------->8---

but for some reason it does not work with defgeneric.
Sorry.

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Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1504
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