/usr/share/fish/completions/rejmerge.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 5 | #completion for rejmerge
complete -f -c rejmerge -o r -l root -d 'Alternative root'
complete -f -c rejmerge -o v -l version -d 'Print version'
complete -f -c rejmerge -o h -l help -d 'Print help'
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