Re: "Missing" libraries/concepts found in other languages/ecosystems?

[John Cowan <cowan@ccil.org>]

Sorry, I meant SIGNAL, not RAISE, in CL.  I'm glad Guile supports `guard`.

On Sat, Jul 11, 2020 at 6:39 PM Chris Vine <vine35792468@gmail.com> wrote:

> On Sat, 11 Jul 2020 14:20:22 -0400
> John Cowan <cowan@ccil.org> wrote:
> > On Sat, Jul 11, 2020 at 6:14 AM Chris Vine <vine35792468@gmail.com>
> wrote:
> >
> > > (To answer the question in your
> > > following email, continuable exceptions are in some sense analogous to
> > > common lisp restarts.)
> >
> > Continuable and non-continuable in Scheme are exactly like CL raise and
> > error (and its variants), except that the machinery is different.
> Restarts
> > are another matter, independent of the condition system (though often
> > considered with it).  I have a pre-SRFI for them at <
> > https://github.com/johnwcowan/r7rs-work/blob/master/RestartsCowan.md>,
> > similar to but simpler than the CL restart system, and using first-class
> > restarts.  It currently lacks restart-case.
>
> I am not an expert on CL so can you provide me with the hyperspec
> reference to CL 'RAISE'?  (I know about CL 'ERROR' and 'SIGNAL'.)
>
> [snip]
> > > R6RS/R7RS's guard form is a wrapper for this which also
> > > incorporates a cond form to enable different exception types to be
> > > handled by different handlers.
> > >
> >
> > Is the intention to provide `guard` in Guile 3.x?
>
> It's been in guile for as long as I can remember (at least since 2.0).
>
>