How to display possible values ​​for fish completion containing asterisks?

[sorairolake]

First, write the following code:

use std::io;

use clap::{CommandFactory, Parser, ValueEnum};
use clap_complete::Shell;

#[derive(Debug, Parser)]
#[command(version, about)]
struct Opt {
    /// Random number generator to use.
    #[arg(long, value_enum, default_value_t)]
    random_number_generator: Rng,

    /// Generate shell completion.
    #[arg(long, value_enum)]
    generate_completion: Option<Shell>,
}

#[derive(Clone, Debug, Default, ValueEnum)]
#[value(rename_all = "lower")]
enum Rng {
    /// The Xorshift PRNG.
    #[default]
    XorShift,

    /// The xoshiro256++ PRNG.
    #[value(name = "xoshiro256++")]
    Xoshiro256PlusPlus,

    /// The xoshiro256** PRNG.
    #[value(name = "xoshiro256**")]
    Xoshiro256StarStar,
}

fn main() {
    let opt = Opt::parse();

    if let Some(shell) = opt.generate_completion {
        clap_complete::generate(
            shell,
            &mut Opt::command(),
            Opt::command().get_name(),
            &mut io::stdout(),
        );
    }

    println!("{opt:?}");
}

Next, generate completions for fish with the following command:

cmd --generate-completion fish > cmd.fish

Then run the following command:

cmd --random-number-generator {possible_values}

In this case, xorshift and xoshiro256++ are displayed as possible values, but xoshiro256** is not displayed as a possible value.

How can I display xoshiro256** as a possible value as well?

Environment

[dependencies]
clap = { version = "4.5.32", features = ["derive"] }
clap_complete = "4.5.47"

$ fish -v
fish, version 4.0.1

[epage]

FYI the current completion scripts are mostly user maintained as I'm not much of a completion user and I'm not an expert at most of the shells (bash is the one I use the most but still not expert level which completions usually requires). For what attention I put to completions, its been towards our up and coming completion system documented at https://docs.rs/clap_complete/latest/clap_complete/env/index.html