Warning: Computing just-done stamp in plan NIL for action

Robert Goldman rpgoldman at sift.info
Wed Oct 18 13:56:44 UTC 2017

Can we issue a STYLE-WARNING, with an explanation for the likely 
explanation (inappropriate use of CLEAR-SYSTEM, possibly related to 
PROVE)?  I figure we are more likely to get compliance if people 
understand what's wrong.

On 18 Oct 2017, at 8:48, Faré wrote:

> On Wed, Oct 18, 2017 at 9:41 AM, Faré <fahree at gmail.com> wrote:
>> There is your culprit: clear-system should NEVER be called within
>> perform. It's removing the rug under ASDF as it's running -- very 
>> BAD,
>> especially if there are many build phases. Unhappily, prove and other
>> prove-based system skeletons (e.g. from caveman) have made this
>> pattern popular. I sent patches to prove & al. at least six months
>> ago, and wrote about this anti-pattern in my "best_practices"
>> document, but I suppose the message didn't go around yet. Maybe I
>> should make it an error for clear-system to be called from within an
>> active asdf-session?
> I see 97 mentions of clear-system in .asd files in quicklisp, so
> obviously I wasn't thorough in chasing these mentions 6 months ago,
> and I shouldn't make that an error until all these mentions are fixed.
> But maybe it's possible to issue a warning? Oh well.
> —♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• 
> http://fare.tunes.org
> "Never ascribe to malice that which is caused by greed and ignorance."
>                 — Cal Keegan

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