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* bug#40180: 27.0.90; cl-concatenate returns wrong result
@ 2020-03-22  9:01 Joost Kremers
  2020-03-22 11:07 ` Stephen Berman
  0 siblings, 1 reply; 6+ messages in thread
From: Joost Kremers @ 2020-03-22  9:01 UTC (permalink / raw)
  To: 40180


`cl-concatenate` seems to return the wrong result:

```
ELISP> (cl-concatenate 'list '(a b c) '(d e f))
((a b c) 
 (d e f))
```

In Emacs 26 the return value was `(a b c d e f)`, which I assume 
should still be the return value in Emacs 27, given that Common 
Lisp hasn't changed. :-)



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-- 
Joost Kremers
Life has its moments





^ permalink raw reply	[flat|nested] 6+ messages in thread

* bug#40180: 27.0.90; cl-concatenate returns wrong result
  2020-03-22  9:01 bug#40180: 27.0.90; cl-concatenate returns wrong result Joost Kremers
@ 2020-03-22 11:07 ` Stephen Berman
  2020-03-22 11:53   ` Noam Postavsky
  0 siblings, 1 reply; 6+ messages in thread
From: Stephen Berman @ 2020-03-22 11:07 UTC (permalink / raw)
  To: Joost Kremers; +Cc: 40180

[-- Attachment #1: Type: text/plain, Size: 815 bytes --]

On Sun, 22 Mar 2020 10:01:34 +0100 Joost Kremers <joostkremers@fastmail.fm> wrote:

> `cl-concatenate` seems to return the wrong result:
>
> ```
> ELISP> (cl-concatenate 'list '(a b c) '(d e f))
> ((a b c)  (d e f))
> ```
>
> In Emacs 26 the return value was `(a b c d e f)`, which I assume should still
> be the return value in Emacs 27, given that Common Lisp hasn't changed. :-)

Similarly, (cl-concatenate 'vector '[a b c] '[d e f]) returns `[[a b c]
[d e f]]' and worse, (cl-concatenate 'string "abc" "def") raises the
error: Wrong type argument: characterp, "abc".  This is because
cl-concatenate is now defined in terms of seq-concatenate, which is
defined by cl-defgeneric, which adds an extra pair of parens around the
SEQUENCES argument.  Hence, the following patch restores the correct
pre-27 behavior:


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: seq-concatenate patch --]
[-- Type: text/x-patch, Size: 861 bytes --]

diff --git a/lisp/emacs-lisp/seq.el b/lisp/emacs-lisp/seq.el
index e3037a7190..adfb63dba8 100644
--- a/lisp/emacs-lisp/seq.el
+++ b/lisp/emacs-lisp/seq.el
@@ -289,11 +289,12 @@ seq-concatenate
 TYPE must be one of following symbols: vector, string or list.

 \n(fn TYPE SEQUENCE...)"
-  (pcase type
-    ('vector (apply #'vconcat sequences))
-    ('string (apply #'concat sequences))
-    ('list (apply #'append (append sequences '(nil))))
-    (_ (error "Not a sequence type name: %S" type))))
+  (let ((sequences (car sequences)))
+    (pcase type
+      ('vector (apply #'vconcat sequences))
+      ('string (apply #'concat sequences))
+      ('list (apply #'append (append sequences '(nil))))
+      (_ (error "Not a sequence type name: %S" type)))))

 (cl-defgeneric seq-into-sequence (sequence)
   "Convert SEQUENCE into a sequence.

[-- Attachment #3: Type: text/plain, Size: 108 bytes --]


Maybe cl-defgeneric should be fixed instead, but I don't understand it
well enough to do so.

Steve Berman

^ permalink raw reply related	[flat|nested] 6+ messages in thread

* bug#40180: 27.0.90; cl-concatenate returns wrong result
  2020-03-22 11:07 ` Stephen Berman
@ 2020-03-22 11:53   ` Noam Postavsky
  2020-03-22 12:00     ` Stephen Berman
  2020-03-22 13:57     ` Eli Zaretskii
  0 siblings, 2 replies; 6+ messages in thread
From: Noam Postavsky @ 2020-03-22 11:53 UTC (permalink / raw)
  To: Stephen Berman; +Cc: Joost Kremers, 40180

[-- Attachment #1: Type: text/plain, Size: 540 bytes --]

tags 40180 + patch
quit

Stephen Berman <stephen.berman@gmx.net> writes:

> Similarly, (cl-concatenate 'vector '[a b c] '[d e f]) returns `[[a b c]
> [d e f]]' and worse, (cl-concatenate 'string "abc" "def") raises the
> error: Wrong type argument: characterp, "abc".  This is because
> cl-concatenate is now defined in terms of seq-concatenate, which is
> defined by cl-defgeneric, which adds an extra pair of parens around the
> SEQUENCES argument

I think the problem is just that cl-concatenate should call
seq-concatenate with apply.


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: patch --]
[-- Type: text/x-diff, Size: 1682 bytes --]

From 97642d1265984c4a22023dc3ff6e8142a325598b Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Sun, 22 Mar 2020 07:48:14 -0400
Subject: [PATCH] Fix cl-concatenate (Bug#40180)

* lisp/emacs-lisp/cl-extra.el (cl-concatenate): Use apply, to avoid
adding extra nesting of args.
* test/lisp/emacs-lisp/cl-extra-tests.el (cl-concatenate): New test.
---
 lisp/emacs-lisp/cl-extra.el            | 2 +-
 test/lisp/emacs-lisp/cl-extra-tests.el | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lisp/emacs-lisp/cl-extra.el b/lisp/emacs-lisp/cl-extra.el
index e9bfe8df5f..ce6fb625bc 100644
--- a/lisp/emacs-lisp/cl-extra.el
+++ b/lisp/emacs-lisp/cl-extra.el
@@ -556,7 +556,7 @@ cl-subseq
 (defun cl-concatenate (type &rest sequences)
   "Concatenate, into a sequence of type TYPE, the argument SEQUENCEs.
 \n(fn TYPE SEQUENCE...)"
-  (seq-concatenate type sequences))
+  (apply #'seq-concatenate type sequences))
 
 ;;; List functions.
 
diff --git a/test/lisp/emacs-lisp/cl-extra-tests.el b/test/lisp/emacs-lisp/cl-extra-tests.el
index 2d20ba75d2..7546c14937 100644
--- a/test/lisp/emacs-lisp/cl-extra-tests.el
+++ b/test/lisp/emacs-lisp/cl-extra-tests.el
@@ -99,4 +99,12 @@ cl-extra-test-cl-make-random-state
     ;; Test for Bug#33731.
     (should-not (eq s (cl-make-random-state s)))))
 
+(ert-deftest cl-concatenate ()
+  (should (equal (cl-concatenate 'list '(1 2 3) '(4 5 6))
+                 '(1 2 3 4 5 6)))
+  (should (equal (cl-concatenate 'vector [1 2 3] [4 5 6])
+                 [1 2 3 4 5 6]))
+  (should (equal (cl-concatenate 'string "123" "456")
+                 "123456")))
+
 ;;; cl-extra-tests.el ends here
-- 
2.11.0


^ permalink raw reply related	[flat|nested] 6+ messages in thread

* bug#40180: 27.0.90; cl-concatenate returns wrong result
  2020-03-22 11:53   ` Noam Postavsky
@ 2020-03-22 12:00     ` Stephen Berman
  2020-03-22 13:57     ` Eli Zaretskii
  1 sibling, 0 replies; 6+ messages in thread
From: Stephen Berman @ 2020-03-22 12:00 UTC (permalink / raw)
  To: Noam Postavsky; +Cc: Joost Kremers, 40180

On Sun, 22 Mar 2020 07:53:31 -0400 Noam Postavsky <npostavs@gmail.com> wrote:

> tags 40180 + patch
> quit
>
> Stephen Berman <stephen.berman@gmx.net> writes:
>
>> Similarly, (cl-concatenate 'vector '[a b c] '[d e f]) returns `[[a b c]
>> [d e f]]' and worse, (cl-concatenate 'string "abc" "def") raises the
>> error: Wrong type argument: characterp, "abc".  This is because
>> cl-concatenate is now defined in terms of seq-concatenate, which is
>> defined by cl-defgeneric, which adds an extra pair of parens around the
>> SEQUENCES argument
>
> I think the problem is just that cl-concatenate should call
> seq-concatenate with apply.

Oh, yes, of course.

Steve Berman





^ permalink raw reply	[flat|nested] 6+ messages in thread

* bug#40180: 27.0.90; cl-concatenate returns wrong result
  2020-03-22 11:53   ` Noam Postavsky
  2020-03-22 12:00     ` Stephen Berman
@ 2020-03-22 13:57     ` Eli Zaretskii
  2020-03-23  3:14       ` Noam Postavsky
  1 sibling, 1 reply; 6+ messages in thread
From: Eli Zaretskii @ 2020-03-22 13:57 UTC (permalink / raw)
  To: Noam Postavsky; +Cc: joostkremers, 40180, stephen.berman

> From: Noam Postavsky <npostavs@gmail.com>
> Date: Sun, 22 Mar 2020 07:53:31 -0400
> Cc: Joost Kremers <joostkremers@fastmail.fm>, 40180@debbugs.gnu.org
> 
> Stephen Berman <stephen.berman@gmx.net> writes:
> 
> > Similarly, (cl-concatenate 'vector '[a b c] '[d e f]) returns `[[a b c]
> > [d e f]]' and worse, (cl-concatenate 'string "abc" "def") raises the
> > error: Wrong type argument: characterp, "abc".  This is because
> > cl-concatenate is now defined in terms of seq-concatenate, which is
> > defined by cl-defgeneric, which adds an extra pair of parens around the
> > SEQUENCES argument
> 
> I think the problem is just that cl-concatenate should call
> seq-concatenate with apply.

Thanks, please push this to the emacs-27 branch.





^ permalink raw reply	[flat|nested] 6+ messages in thread

* bug#40180: 27.0.90; cl-concatenate returns wrong result
  2020-03-22 13:57     ` Eli Zaretskii
@ 2020-03-23  3:14       ` Noam Postavsky
  0 siblings, 0 replies; 6+ messages in thread
From: Noam Postavsky @ 2020-03-23  3:14 UTC (permalink / raw)
  To: Eli Zaretskii; +Cc: joostkremers, 40180, stephen.berman

tags 40180 fixed
close 40180 27.1
quit

Eli Zaretskii <eliz@gnu.org> writes:

> Thanks, please push this to the emacs-27 branch.

Done.

[1: 9ab85f087f]: 2020-03-22 23:06:31 -0400
  Fix cl-concatenate (Bug#40180)
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=9ab85f087f7db38168dcf07d24f51ecd2c583f8a





^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2020-03-23  3:14 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-03-22  9:01 bug#40180: 27.0.90; cl-concatenate returns wrong result Joost Kremers
2020-03-22 11:07 ` Stephen Berman
2020-03-22 11:53   ` Noam Postavsky
2020-03-22 12:00     ` Stephen Berman
2020-03-22 13:57     ` Eli Zaretskii
2020-03-23  3:14       ` Noam Postavsky

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