* bug#39395: GOOPS generic promotion fails for nary functions
@ 2020-02-02 19:04 Rob Browning
2020-02-07 6:39 ` Rob Browning
0 siblings, 1 reply; 2+ messages in thread
From: Rob Browning @ 2020-02-02 19:04 UTC (permalink / raw)
To: 39395
I noticed that this fails in (at least) 2.0, 2.2 and 3.0:
(use-modules (oop goops))
(define (foo . rest) 'fallback)
(define-method (foo (x <string>)) <string>)
e.g.:
$ guile-3.0 -s test.scm
Backtrace:
In ice-9/boot-9.scm:
1736:10 6 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
5 (apply-smob/0 #<thunk 558f3c1bbb80>)
In ice-9/boot-9.scm:
718:2 4 (call-with-prompt _ _ #<procedure default-prompt-handle?>)
In ice-9/eval.scm:
619:8 3 (_ #(#(#<directory (guile-user) 558f3c28bf00>)))
In ice-9/boot-9.scm:
2806:4 2 (save-module-excursion _)
4351:12 1 (_)
In oop/goops.scm:
1585:2 0 (_ _ _)
And then I found that the the manual says this:
If symbol was previously bound to a Scheme procedure (or
procedure-with-setter), the old procedure (and setter) is incorporated
into the new generic function as its default procedure (and setter).
So I wondered if this might be a bug, or was expected behavior. It's
also easy to work around -- just change the first define to a
define-method.
Thanks
--
Rob Browning
rlb @defaultvalue.org and @debian.org
GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A
GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4
^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#39395: GOOPS generic promotion fails for nary functions
2020-02-02 19:04 bug#39395: GOOPS generic promotion fails for nary functions Rob Browning
@ 2020-02-07 6:39 ` Rob Browning
0 siblings, 0 replies; 2+ messages in thread
From: Rob Browning @ 2020-02-07 6:39 UTC (permalink / raw)
To: 39395
Rob Browning <rlb@defaultvalue.org> writes:
> And then I found that the the manual says this:
>
> If symbol was previously bound to a Scheme procedure (or
> procedure-with-setter), the old procedure (and setter) is incorporated
> into the new generic function as its default procedure (and setter).
>
> So I wondered if this might be a bug, or was expected behavior. It's
> also easy to work around -- just change the first define to a
> define-method.
Not sure if this might be related. With guile-3.0
(use-modules (oop goops))
(define x close)
(define-generic x)
produces:
$ guile-3.0 -s test.scm
;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
;;; or pass the --no-auto-compile argument to disable.
;;; compiling /home/rlb/test.scm
;;; /home/rlb/test.scm:5:0: warning: shadows previous definition of `x' at /home/rlb/test.scm:4:0
;;; compiled /home/rlb/.cache/guile/ccache/3.0-LE-8-4.2/home/rlb/test.scm.go
Thanks
--
Rob Browning
rlb @defaultvalue.org and @debian.org
GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A
GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4
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