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bug in ${##} expansion

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From: Eric Blake <eblake@xxxxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: bug in ${##} expansion
Date: Fri, 11 Mar 2011 12:07:20 -0700
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POSIX requires ${#parameter} to expand to the length of parameter as a
string.  It also requires that ${parameter#word} substitution have a
word (that is, ${parameter#} with a missing word is a zsh extension).

Therefore, this should output 2, not 11:

zsh -c 'set 1 2 3 4 5 6 7 8 9 10 11; echo ${##}'

-- 
Eric Blake   eblake@xxxxxxxxxx    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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Follow-Ups:
- Re: bug in ${##} expansion
  - From: Peter Stephenson

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