New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Arthur A. Gleckler 02 Jul 2020 05:56 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Shiro Kawai 02 Jul 2020 12:50 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types John Cowan 02 Jul 2020 13:19 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 07 Jul 2020 14:23 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types John Cowan 07 Jul 2020 20:32 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 08 Jul 2020 14:27 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Wolfgang Corcoran-Mathe 08 Jul 2020 19:47 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 08 Jul 2020 20:21 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types John Cowan 09 Jul 2020 04:32 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 09 Jul 2020 09:30 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types John Cowan 10 Jul 2020 14:05 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 10 Jul 2020 14:39 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Wolfgang Corcoran-Mathe 10 Jul 2020 17:30 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 10 Jul 2020 17:50 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Wolfgang Corcoran-Mathe 11 Jul 2020 15:22 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 11 Jul 2020 15:30 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Wolfgang Corcoran-Mathe 11 Jul 2020 16:17 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Alex Shinn 11 Jul 2020 22:20 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 11 Jul 2020 22:29 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Wolfgang Corcoran-Mathe 12 Jul 2020 03:35 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 11 Jul 2020 16:33 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types John Cowan 11 Jul 2020 18:44 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 11 Jul 2020 19:26 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Arthur A. Gleckler 11 Jul 2020 19:59 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 11 Jul 2020 20:06 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Arthur A. Gleckler 11 Jul 2020 20:08 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Marc Nieper-Wißkirchen 14 Jul 2020 09:13 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types John Cowan 14 Jul 2020 21:15 UTC
Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Alex Shinn 15 Jul 2020 00:07 UTC

Re: New draft (#8) of and new "last call" for SRFI 189: Maybe and Either: optional container types Wolfgang Corcoran-Mathe 11 Jul 2020 15:22 UTC

On 2020-07-10 16:39 +0200, Marc Nieper-Wißkirchen wrote:
> The following tests pass:
>
> [snip]
>
>   (check (either= eqv? (with-exception-handler
>                            (lambda (x)
>                              (+ 1 x))
>                         (lambda ()
>                            (either-guard string? (+ 2 (raise-continuable 39)))))
>                  (right 42))
>      => #t))

Thanks very much for the implementation and the tests.

This final test causes an "exception handler returned" error on Chibi
when either->exception / either-guard is implemented with guard.  If
I'm reading R7 right, this is to be expected, as guard always invokes
raise if none of its clauses succeed.  Thus, the continuation is lost.

I think John is right that we must use with-exception-handler.

--
Wolfgang Corcoran-Mathe  <xxxxxx@sigwinch.xyz>

"Simplicity does not precede complexity, but follows it."
--Alan J. Perlis