Parse subcommand with any unique prefix

[lxl66566]

I want to know if there is a way to parse subcommands with any unique prefix.
An example, in reality, is the btrfs command: all valid prefixes (ex. f, fi, fil, file, files...) will be parsed as subcommand filesystem; if there's any conflict(ambiguous) token, btrfs will refuse to parse and print a lint, like exec btrfs s:

btrfs: ambiguous token 's'

Did you mean one of these?
        scrub
        send
        subvolume

I only found a way to approach this by using aliases and putting all possible and non-conflict subcommands manually. But with the increase of subcommand number, it'll become unmaintainable.

[epage]

I generally recommend having a fixed set of aliases (e.g. cargo b being an alias for cargo build) rather than allowing it to be arbitrary as that introduces backwards-compatibility hazards but we do have the Command::infer_subcommands feature for this.

[lxl66566]

Thank you! I'm sorry for missing that doc,