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23f2ba7ae0
The fish shell comes with builtin completions. For example, git completion supports context-aware completion of things like commit hashes, branch names, sub-commands, etc. Until fish 4.2, builtin completions were explicitly loaded from `share/fish/completions`, however that is now deprecated and disabled. In effect, this means generating manpage-based completion will shadow and disable builtin completion. Avoid that, by only generating completion when fish does not have builtin support for the command.