[debbugs-tracker] bug#9672: closed (bug in SRFI-30 comment parser)

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Your message dated Wed, 05 Oct 2011 20:49:53 +0200
with message-id <address@hidden>
and subject line Re: bug#9672: bug in SRFI-30 comment parser
has caused the debbugs.gnu.org bug report #9672,
regarding bug in SRFI-30 comment parser
to be marked as done.

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9672: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=9672
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> --- Begin Message ---
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> Subject: 
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> bug in SRFI-30 comment parser
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> Date: 
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> Tue, 4 Oct 2011 23:45:19 +0200
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> User-agent: 
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> KMail/1.13.6 (Linux/2.6.37.6-0.5-desktop; KDE/4.6.0; x86_64; ; )
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> Hi,
>
> Block comments whose contents end with an odd number of vertical bars are not
> parsed correctly by guile-2.0.2.
>
> The guile manual [1] says:
>   "Guile (starting from version 2.0) supports nested block comments
>    as specified by R6RS and SRFI-30"
>
> R6RS [2] says:
>   "Block comments may be indicated with properly nested #|and |# pairs."
>
> More formally, SRFI-30 [3] implies that in particular
>
>   #| <comment-text> |#
>
> is a comment, where
>
>   <comment-text> ---> <character sequence not containing #| or |#>
>
> Now look at this guile session: When I use a <comment-text> that ends in
> 1 or 3 or 5 ... trailing vertical bars, guile misses the end of the
> block comment and hangs.
>
> scheme@(guile-user)> '(a #|foo|# b)
> $1 = (a b)
> scheme@(guile-user)> '(a #|foo|||# b)
> $2 = (a b)
> scheme@(guile-user)> '(a #|foo|||||# b)
> $3 = (a b)
> scheme@(guile-user)> '(a #|foo||# b)
> [hangs]
>
> scheme@(guile-user)> '(a #|foo||||# b)
> [hangs]
>
> The bug is most likely located in libguile/read.c,
> function scm_read_r6rs_block_comment, line 1204.
>
> Bruno
>
> [1] http://www.gnu.org/software/guile/manual/html_node/Block-Comments.html
> [2] http://www.r6rs.org/final/html/r6rs/r6rs-Z-H-7.html#node_sec_4.2.3
> [3] http://srfi.schemers.org/srfi-30/srfi-30.html
> --
> In memoriam Irena Iłłakowicz <http://en.wikipedia.org/wiki/Irena_Iłłakowicz>
>
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> --- End Message ---
> --- Begin Message ---
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> Subject: 
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> Re: bug#9672: bug in SRFI-30 comment parser
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>
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> Date: 
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> Wed, 05 Oct 2011 20:49:53 +0200
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> User-agent: 
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> Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux)
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> Thanks for the note, Bruno.  I have fixed the bug in stable-2.0.
>
> Cheers,
>
> Andy
> -- 
> http://wingolog.org/
>
>
> --- End Message ---