/usr/share/bash-completion/completions/whiptail is in whiptail 0.52.20-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | complete -W "--msgbox --yesno --infobox --inputbox --passwordbox --textbox --menu --checklist \
--radiochecklist --gauge --clear --defaultno --default-item \
--fb --nocancel --yes-button --no-button --ok-button \
--cancel-button -noitem --separate-output --output-fd \
--title --backtitle -scrolltext --toplefti \
--help" -f whiptail
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