Can not ust [EXE] in subcommand

[hi-rustin]

1. use trycmd in rustup project
2. create a test

use rustup::utils::utils;

#[test]
fn ui_tests() {
    let t = trycmd::TestCases::new();
    let rustup_init = trycmd::cargo::cargo_bin("rustup-init");
    let rustup = trycmd::cargo::cargo_bin("rustup");
    t.register_bin("rustup-init", &rustup_init);
    // Copy rustup-init to rustup so that the tests can run it.
    utils::copy_file(&rustup_init, &rustup).unwrap();
    t.register_bin("rustup", &rustup);
    t.case("tests/cli-ui/*.toml");
}

3. test the subcommand's help test

bin.name = "rustup"
args = ["set","auto-self-update","--help"]
stdout = """
rustup-set-auto-self-update
The rustup auto self update mode

USAGE:
    rustup[EXE] set auto-self-update <auto-self-update-mode>

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

ARGS:
    <auto-self-update-mode>     [default: enable]  [possible values: enable, disable, check-only]
"""
stderr = ""

4. If I change the first line to rustup[EXE]-set-auto-self-update
5. Run the test with TRYCMD=overwrite , it will delete the [EXE]
6. If I don't put the EXE into the subcommand help text, then you will get an error:

Testing tests\cli-ui\rustup_set_cmd_auto-self-update_cmd_help_flag_stdout.toml ... failed
Exit: success

---- expected: stdout
++++ actual:   stdout
   1      - rustup-set-auto-self-update 
        1 + rustup[EXE]-set-auto-self-update 
   2    2 | The rustup auto self update mode
   3    3 | 
   4    4 | USAGE:
   5      -     rustup set auto-self-update <auto-self-update-mode>
        5 +     rustup[EXE] set auto-self-update <auto-self-update-mode>
   6    6 | 
   7    7 | FLAGS:
   8    8 |     -h, --help       Prints help information
   9    9 |     -V, --version    Prints version information
  10   10 | 
  11   11 | ARGS:
  12   12 |     <auto-self-update-mode>     [default: enable]  [possible values: enable, disable, check-only]

See: https://github.com/rust-lang/rustup/actions/runs/4150479617/jobs/7180163449

[hi-rustin]

Now, I just use ... as a workaround.

[hi-rustin]

I see, this seems a bug of clap. clap-rs/clap#3693

[epage]

Want to take on updating from clap 2 to clap 4?

• 2 to 3 migration guide
• 3 to 4 migration guide