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Subject: The options variable of _arguments.
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From: Tanaka Akira <akr@jaist.ac.jp>
Date: 14 Sep 1999 05:32:47 +0900
Message-ID: <rsqbtb6h7rk.fsf@crane.jaist.ac.jp>
User-Agent: Chao-gnus/6.12.5 AKEMI/1.13.2 (=?ISO-2022-JP?B?GyRCQTAbKEI=?=
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 (=?ISO-2022-JP?B?GyRCM3cbKEI=?= 10R4.0/5.0) Emacs/20.4
 (sparc-sun-solaris2.6) MULE/4.0 (HANANOEN)

Z(2):akr@is27e1u11% Src/zsh -f
is27e1u11% bindkey -e; fpath=($PWD/Completion/*(/)); autoload -U compinit; compinit -D; compdef _tst tst
is27e1u11% _tst () { _arguments -s '-a' '-b' ':descr:{ compadd - $+options[-a] }' }
is27e1u11% tst -ab <TAB>

->

is27e1u11% tst -ab 0 

Hm. It should be:

is27e1u11% tst -ab 1
-- 
Tanaka Akira