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Date: Sun, 24 Nov 2013 08:44:56 -0700
From: John <jmharres@gmail.com>
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Subject: compsys: argument with pre-requisite argument
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I understand the exclusion option for an _arguments list, but I'm 
wondering if there is anything of the sort that would allow me to have 
pre-requisite arguments.  I haven't found an example to work off, but 
what I want is something like:

_arguments \
         '-D+[debug]:debug level(0 1)' \
         '--opt1[opt1 description]' \
         '--special[special case]' \
         '-a[special case a]' \
         '-b[special case b]'

such that -a and -b are only available if --special was already 
specified, but --opt1 and -D are always available for completing.

TIA,
John