These four completions all have a strange pattern (that doesn't
work.)
set -l subcommands cmd1 cmd2 cmd3 ...
complete -n "__fish_use_subcommand $subcommands" -c foo -a cmd1
complete -n "__fish_use_subcommand $subcommands" -c foo -a cmd2
complete -n "__fish_use_subcommand $subcommands" -c foo -a cmd3
Remove the redundant lists of subcommands and the unused argument
passed to __fish_use_subcommand for bosh, cf, mariner, and port.