Problem with case - Racket Users

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Message from discussion Problem with case
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Date: Mon, 17 Sep 2012 19:22:03 -0400
Message-ID: <CAKfDxxx2Z-UD+odPVYFcFvBJz4o1qUn84+23krVPGz9RLXt...@mail.gmail.com>
From: Jon Zeppieri <zeppi...@gmail.com>
To: David Van Horn <dvanh...@ccs.neu.edu>
Cc: users <us...@racket-lang.org>
Subject: Re: [racket] Problem with case
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On Mon, Sep 17, 2012 at 7:15 PM, David Van Horn <dvanh...@ccs.neu.edu>wrote:

> On 9/17/12 7:11 PM, Jon Zeppieri wrote:
>
>> The fact that the first one works at all should probably be considered a
>> bug. The syntax of case here:
>>
>> http://docs.racket-lang.org/**reference/case.html?q=case#(**
>> form._((lib._racket/private/**more-scheme..rkt)._case))<http://docs.racket-lang.org/reference/case.html?q=case#(form._((lib._racket/private/more-scheme..rkt)._case))>
>>
>> dictates that the constants in a case clause be parenthesized.
>>
>
> But they *are* parenthesized... after the reader expands '.
>
> That's why you can do weird things like ((lambda 'x ''''''x) add1 0).
>
> David
>
>
Oh my. Right. That's...  Wow.
I hadn't considered the possibilities for obfuscating racket code.

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<br><br><div class=3D"gmail_quote">On Mon, Sep 17, 2012 at 7:15 PM, David V=
an Horn <span dir=3D"ltr">&lt;<a href=3D"mailto:dvanh...@ccs.neu.edu" targe=
t=3D"_blank">dvanh...@ccs.neu.edu</a>&gt;</span> wrote:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex">
<div class=3D"im">On 9/17/12 7:11 PM, Jon Zeppieri wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
The fact that the first one works at all should probably be considered a<br=
>
bug. The syntax of case here:<br>
<br>
<a href=3D"http://docs.racket-lang.org/reference/case.html?q=3Dcase#(form._=
((lib._racket/private/more-scheme..rkt)._case))" target=3D"_blank">http://d=
ocs.racket-lang.org/<u></u>reference/case.html?q=3Dcase#(<u></u>form._((lib=
._racket/private/<u></u>more-scheme..rkt)._case))</a><br>

<br>
dictates that the constants in a case clause be parenthesized.<br>
</blockquote>
<br></div>
But they *are* parenthesized... after the reader expands &#39;.<br>
<br>
That&#39;s why you can do weird things like ((lambda &#39;x &#39;&#39;&#39;=
&#39;&#39;&#39;x) add1 0).<span class=3D"HOEnZb"><font color=3D"#888888"><b=
r>
<br>
David<br><br></font></span></blockquote><div><br></div><div>Oh my. Right. T=
hat&#39;s... =A0Wow.=A0</div><div>I hadn&#39;t considered the possibilities=
 for obfuscating racket code.</div></div>

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