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Re: "error" special form or procedure?

>> 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?