bug in patterns used for filename expansion (e.g. a[b/c]d)

[Vincent Lefevre <vincent@xxxxxxxxxx>]

zsh 4.3.4 isn't POSIX-compliant concerning filename expansion and
unmatched [. POSIX[*] says:

  For example, the pattern "a[b/c]d" does not match such pathnames as
  abd or a/d. It only matches a pathname of literally a[b/c]d.

[*] http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13_03

But with zsh 4.3.4:

prunille% ls a[b/c]d
zsh: no matches found: a[b/c]d

while the file exists (no problem with bash, dash or ksh93). For more
information, see the following thread:

https://www.opengroup.org/sophocles/show_archive.tpl?source=L&listname=austin-group-l&first=1&pagesize=80&searchstring=Defect+in+XCU+2.13.3&zone=G

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Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <http://www.vinc17.org/>
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Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)