System cleanup

[Robert Goldman]

Didier, would you mind posting a GitLab issue for this? It's feasible, 
but I'm so overloaded right now that there's no chance I will get to it 
before I forget.

Thanks

On 19 Mar 2021, at 8:34, Didier Verna wrote:

> François-René ÐVB Rideau écrivait:
>
>> Before it can be ignored, it must be defined. And so as to define it,
>> its class must be defined. I suppose we could have some error class
>> that it used when the class it not defined, that would only trigger 
>> an
>> error at runtime if the feature is true. I'm sure the current / next
>> sucker^W maintainer will accept patches.
>
>   Not a big deal. I just thought that since everything in that form 
> are
>   keywords (so no read-time problem, as opposed to parsing
>   sb-grovel:grovel-constants-file), perhaps the intended behavior was
>   different.
>
>   So in the end, it seems that there's very little (if at all) to be
>   gained by using :if-feature to conditionalize on implementation 
> type.
>
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