>> But a special form (as Marc Feeley has pointed out)
>> could make the location in the source file available
>> for diagnostics. I would propose an additional special
>> form that can invoke the procedure "error":
>
>I think this is redundant.  most compilers probably provide _some_ way
>to treat a keyword as a special form if possible, and treat it as a
>variable reference otherwise.

Good point.

>  you certainly can do such a thing using syntax-case, for instance.

This might be a stupid question, but how does it (syntax-case)
does that?

cheers,
felix