/usr/share/fish/completions/trap.fish is in fish-common 2.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | complete -c trap -s l -l list-signals --description 'Display names of all signals'
complete -c trap -s p -l print --description 'Display all currently defined trap handlers'
complete -c trap -s h -l help --description 'Display help and exit'
complete -c trap -a '(trap -l | sed "s/ /\n/g")' --description 'Signal'
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