[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: "error" special form or procedure?

This page is part of the web mail archives of SRFI 23 from before July 7th, 2015. The new archives for SRFI 23 contain all messages, not just those from before July 7th, 2015.

"felix" <felixundduni@xxxxxxxxxx> writes:

> I think it should be made explicit wether "error" is a
> special form or procedure. The spec calls it a procedure first and
> later says it's a "procedure or special form".
> Things like
> (define my-error-handler (make-parameter error))
> are of course not possible with a special form. One also
> can not use "apply" on it.

agreed, it should be specified as a 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.  you certainly can do such a thing using
syntax-case, for instance.

now if the SRFI _required_ that source location info be provided, then
I would completely agree with you.

You have a tendency to feel you are superior to most computers.