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Glitch in _zle completion function

X-seq: zsh-workers 26599
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: zsh-workers@xxxxxxxxxx
Subject: Glitch in _zle completion function
Date: Tue, 24 Feb 2009 20:39:38 -0800
Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm

schaefer<501> zle blather <TAB>
_zle:shift:69: shift count must be <= $#
_zle:shift:70: shift count must be <= $#
_zle:shift:69: shift count must be <= $#
_zle:shift:70: shift count must be <= $#
_zle:shift:69: shift count must be <= $#
_zle:shift:70: shift count must be <= $#
_zle:shift:69: shift count must be <= $#
_zle:shift:70: shift count must be <= $#
schaefer<501> zle blather 
Completing widget arguments

(the shell printed a newline after all those errors, redrew the prompt,
and then displayed "Completing widget arguments" per my format style,
all from a single tab press).

What's happening is that we call _arguments to set $state, then go into
the "while (( $#state )): do" loop, inside which _arguments is called a
second time, which clears $state and $context so that the pair of shifts
at lines 69-70 subsequently fail.

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