Re: [Readable-discuss] Readable version 1.0.2 released!

[David A. W. <dwh...@dw...>]

On Sat, 28 Jun 2014 21:50:53 -0400, John Cowan <co...@me...> wrote:

> Another point is that not supporting `else` is non-conformant all the
> way back to R2RS. Not supporting it makes Guile 1.6 a Not-Quite-Scheme.

Which just shows the need for standards and standards test suites.
To be fair, guile fixed this years ago.

> A third point is that a one-line hack for Guile 1.6 fixes the problem:
> 
> 	(define else #t)
> 
> Just make sure this line isn't present for any real Scheme.

I doubt that'll work.  "else" is also used in (cond-expand ...) and (case ...).
I don't have a guile 1.6 handy, but I do have guile 1.8.  In 1.8, this works:
  (case #\a (else (display "hi")))
yet this fails:
  (define else #t)
  (case #\a (else (display "hi")))
and I suspect the same would be true for guile 1.6.

Thanks for the idea though!!

--- David A. Wheeler