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Currently, completions have to be specified like ```fish complete -c foo -l opt ``` while ```fish complete foo -l opt ``` just complains about there being too many arguments. That's kinda useless, so we just assume if there is one left-over argument that it's meant to be the command. Theoretically we could also use *all* the arguments as commands to complete, but that seems unlikely to be what the user wants. (I don't think multi-command completions really happen)