GNU bug report logs - #32841
assoc-set fails with dot notation association list

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Package: guile; Reported by: "Hood, Christopher L." <Christopher.Hood@HIDDEN>; dated Tue, 25 Sep 2018 20:41:02 UTC; Maintainer for guile is bug-guile@HIDDEN.

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From: John Cowan <cowan@HIDDEN>
Date: Thu, 27 Sep 2018 08:09:46 -0400
Message-ID: <CAD2gp_RxPVhDxLt_Np_XMP=r2QxY5zVbW-+W65znqqA1f-+Y8A@HIDDEN>
Subject: Re: bug#32841: assoc-set fails with dot notation association list
To: Mark H Weaver <mhw@HIDDEN>
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On Wed, Sep 26, 2018 at 11:03 PM Mark H Weaver <mhw@HIDDEN> wrote:


> To initialize an alist that will be mutated, you must instead do
> something like this:
>
>   (define capitals (list (cons "New York" "Albany")
>                          (cons "Oregon"   "Salem")
>                          (cons "Florida"  "Miami")))
>

More simply, you can wrap the literal in a call to copy-tree.  This returns
a deep copy of the literal that is fully mutable.

-- 
John Cowan          http://vrici.lojban.org/~cowan        cowan@HIDDEN
Here lies the Christian, judge, and poet Peter,
Who broke the laws of God and man and metre.

--000000000000aa43b80576d937d2
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<div dir=3D"ltr"><div dir=3D"ltr"><br><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr">On Wed, Sep 26, 2018 at 11:03 PM Mark H Weaver &lt;<a href=3D"ma=
ilto:mhw@HIDDEN">mhw@HIDDEN</a>&gt; wrote:<br></div><div>=C2=A0</di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex">
To initialize an alist that will be mutated, you must instead do<br>
something like this:<br>
<br>
=C2=A0 (define capitals (list (cons &quot;New York&quot; &quot;Albany&quot;=
)<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0(cons &quot;Oregon&quot;=C2=A0 =C2=A0&quot;Salem&quot;)<br=
>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0(cons &quot;Florida&quot;=C2=A0 &quot;Miami&quot;)))<br></=
blockquote><div><br></div><div>More simply, you can wrap the literal in a c=
all to copy-tree.=C2=A0 This returns</div><div>a deep copy of the literal t=
hat is fully mutable.</div><div><br></div><div>--=C2=A0</div><div><div>John=
 Cowan=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"http://vrici.lojban.org=
/~cowan">http://vrici.lojban.org/~cowan</a>=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a h=
ref=3D"mailto:cowan@HIDDEN">cowan@HIDDEN</a></div><div>Here lies the Ch=
ristian, judge, and poet Peter,</div><div>Who broke the laws of God and man=
 and metre.</div></div><div><br></div></div></div></div>

--000000000000aa43b80576d937d2--




Information forwarded to bug-guile@HIDDEN:
bug#32841; Package guile. Full text available.

Message received at 32841 <at> debbugs.gnu.org:


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From: Mark H Weaver <mhw@HIDDEN>
To: "Hood\, Christopher L." <Christopher.Hood@HIDDEN>
Subject: Re: bug#32841: assoc-set fails with dot notation association list
References: <d61a791aaa734245ac705bb5196ff18e@HIDDEN>
Date: Wed, 26 Sep 2018 23:02:17 -0400
In-Reply-To: <d61a791aaa734245ac705bb5196ff18e@HIDDEN> (Christopher
 L. Hood's message of "Tue, 25 Sep 2018 20:33:41 +0000")
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Hi Christopher,

"Hood, Christopher L." <Christopher.Hood@HIDDEN> writes:
> This fails with code pulled straight out of the Guile manual example
> (section 6.6.20.6).

Indeed, the example code in the manual is bad.  Thanks for bringing this
to our attention.

> (define capitals '(("New York" . "Albany")
>                    ("Oregon"   . "Salem")
>                    ("Florida"  . "Miami")))

As John correctly pointed out, it's an error to mutate a program
literal.  It's analogous to trying to modify a string literal in C.
'assoc-set!' mutates the existing list structure in some cases, and so
it cannot be used on literals such as the one above.

To initialize an alist that will be mutated, you must instead do
something like this:

  (define capitals (list (cons "New York" "Albany")
                         (cons "Oregon"   "Salem")
                         (cons "Florida"  "Miami")))

> I=E2=80=99ll note that if you define the alist so its initial contents are
> defined using a quasiquote and the cons form instead of dot notation,
> this error is not reached.

Yes, that accomplishes essentially the same thing, although note that
quasiquote makes an effort to use program literals for parts of the
resulting list structure, e.g.:

  `(,a ,b c d)

expands to:

  (cons a (cons b '(c d)))

which means that the first two cons cells can be mutated, but the last
two are part of an immutable program literal.

> I=E2=80=99m not sure if the error is valid or not, but in any case, the c=
ode
> that produces is listed as an valid example in the manual, so that
> doesn=E2=80=99t seem right.

Indeed, the manual needs to be fixed.  Sorry for the confusion, and
thanks again for the bug report.

     Mark




Information forwarded to bug-guile@HIDDEN:
bug#32841; Package guile. Full text available.

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Subject: Re: bug#32841: assoc-set fails with dot notation association list
To: Christopher.Hood@HIDDEN
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The error is valid, because you are attempting to mutate a program
literal.  Scheme makes that an error, and Guile enforces it (though many
Schemes do not).

On Tue, Sep 25, 2018 at 4:41 PM Hood, Christopher L. <
Christopher.Hood@HIDDEN> wrote:

> This fails with code pulled straight out of the Guile manual example
> (section 6.6.20.6).
>
>
>
> (define capitals '(("New York" . "Albany")
>
>                    ("Oregon"   . "Salem")
>
>                    ("Florida"  . "Miami")))
>
>
>
> Okay, that works define to define alist capitals. Now let=E2=80=99s try a=
nother
> part of the example:
>
>
>
> (set! capitals
>
>       (assoc-set! capitals "Florida" "Tallahassee"))
>
>
>
> This yields the error:
>
>
>
> ERROR: In procedure assoc-set!:
>
> In procedure set-cdr!: Wrong type argument in position 1 (expecting
> mutable pair): ("Florida" . "Miami")
>
>
>
> I=E2=80=99ve experienced this behavior with builds of both Guile 2.2.2 an=
d Guile
> 2.2.4.
>
>
>
> I=E2=80=99ll note that if you define the alist so its initial contents ar=
e defined
> using a quasiquote and the cons form instead of dot notation, this error =
is
> not reached. I=E2=80=99m not sure if the error is valid or not, but in an=
y case,
> the code that produces is listed as an valid example in the manual, so th=
at
> doesn=E2=80=99t seem right.
>
>
>
> chris
>

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<div dir=3D"ltr">The error is valid, because you are attempting to mutate a=
 program literal.=C2=A0 Scheme makes that an error, and Guile enforces it (=
though many Schemes do not).</div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr">On Tue, Sep 25, 2018 at 4:41 PM Hood, Christopher L. &lt;<a href=
=3D"mailto:Christopher.Hood@HIDDEN">Christopher.Hood@HIDDEN=
du</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_6244735662910326147WordSection1">
<p class=3D"MsoNormal">This fails with code pulled straight out of the Guil=
e manual example (section 6.6.20.6).<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">(define capitals &#39;((&quot;New York&quot; . &quot;Alban=
y&quot;)<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (&quot;Oregon&quot;=C2=
=A0=C2=A0 . &quot;Salem&quot;)<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (&quot;Florida&quot;=C2=
=A0 . &quot;Miami&quot;)))<u></u><u></u></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Okay, that works define to define alist capitals. No=
w let=E2=80=99s try another part of the example:<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<pre>(set! capitals<u></u><u></u></pre>
<pre>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (assoc-set! capitals &quot;Florida&quot=
; &quot;Tallahassee&quot;))<u></u><u></u></pre>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">This yields the error: <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">ERROR: In procedure assoc-set!:<u></u><u></u></p>
<p class=3D"MsoNormal">In procedure set-cdr!: Wrong type argument in positi=
on 1 (expecting mutable pair): (&quot;Florida&quot; . &quot;Miami&quot;)<u>=
</u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I=E2=80=99ve experienced this behavior with builds o=
f both Guile 2.2.2 and Guile 2.2.4.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I=E2=80=99ll note that if you define the alist so it=
s initial contents are defined using a quasiquote and the cons form instead=
 of dot notation, this error is not reached. I=E2=80=99m not sure if the er=
ror is valid or not, but in any case, the code that
 produces is listed as an valid example in the manual, so that doesn=E2=80=
=99t seem right.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">chris<u></u><u></u></p>
</div>
</div>

</blockquote></div>

--000000000000ac204b0576b94c44--




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bug#32841; Package guile. Full text available.

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This fails with code pulled straight out of the Guile manual example (secti=
on 6.6.20.6).

(define capitals '(("New York" . "Albany")
                   ("Oregon"   . "Salem")
                   ("Florida"  . "Miami")))

Okay, that works define to define alist capitals. Now let's try another par=
t of the example:


(set! capitals

      (assoc-set! capitals "Florida" "Tallahassee"))

This yields the error:

ERROR: In procedure assoc-set!:
In procedure set-cdr!: Wrong type argument in position 1 (expecting mutable=
 pair): ("Florida" . "Miami")

I've experienced this behavior with builds of both Guile 2.2.2 and Guile 2.=
2.4.

I'll note that if you define the alist so its initial contents are defined =
using a quasiquote and the cons form instead of dot notation, this error is=
 not reached. I'm not sure if the error is valid or not, but in any case, t=
he code that produces is listed as an valid example in the manual, so that =
doesn't seem right.

chris

--_000_d61a791aaa734245ac705bb5196ff18egtrigatechedu_
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">This fails with code pulled straight out of the Guil=
e manual example (section 6.6.20.6).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">(define capitals '((&quot;New York&quot; . &quot;Albany&qu=
ot;)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (&quot;Oregon&quot;&nbsp=
;&nbsp; . &quot;Salem&quot;)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (&quot;Florida&quot;&nbs=
p; . &quot;Miami&quot;)))<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Okay, that works define to define alist capitals. No=
w let&#8217;s try another part of the example:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>(set! capitals<o:p></o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (assoc-set! capitals &quot;Florida&quot=
; &quot;Tallahassee&quot;))<o:p></o:p></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This yields the error: <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">ERROR: In procedure assoc-set!:<o:p></o:p></p>
<p class=3D"MsoNormal">In procedure set-cdr!: Wrong type argument in positi=
on 1 (expecting mutable pair): (&quot;Florida&quot; . &quot;Miami&quot;)<o:=
p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;ve experienced this behavior with builds of =
both Guile 2.2.2 and Guile 2.2.4.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;ll note that if you define the alist so its =
initial contents are defined using a quasiquote and the cons form instead o=
f dot notation, this error is not reached. I&#8217;m not sure if the error =
is valid or not, but in any case, the code that
 produces is listed as an valid example in the manual, so that doesn&#8217;=
t seem right.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">chris<o:p></o:p></p>
</div>
</body>
</html>

--_000_d61a791aaa734245ac705bb5196ff18egtrigatechedu_--




Acknowledgement sent to "Hood, Christopher L." <Christopher.Hood@HIDDEN>:
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Report forwarded to bug-guile@HIDDEN:
bug#32841; Package guile. Full text available.
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