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zsh/Completion/Commands/_complete_debug

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#compdef -k complete-word \C-x?
setopt localoptions nullglob rcexpandparam extendedglob
unsetopt markdirs globsubst shwordsplit nounset ksharrays
(( $+_debug_count )) || integer -g _debug_count
local tmp=${TMPPREFIX}${$}${words[1]:t}$[++_debug_count]
local w="${(qqq)words}"
[[ -t 2 ]] && exec 3>&2 2>| $tmp
setopt xtrace
_main_complete
integer ret=$?
unsetopt xtrace
[[ -t 2 ]] || {
## Calling "print -s" during completion is presently broken.
# _message -r "Trace output left in $tmp (up-history to view)"
# print -sR "${VISUAL:-${EDITOR:-${PAGER:-more}}} $tmp ;: $w"
_message -r "Trace output left in $tmp"
print -zR "${VISUAL:-${EDITOR:-${PAGER:-more}}} $tmp ;: $w"
exec 2>&3 3>&-
}
return ret