Function outcome 

pub fn outcome<'v, T>(
    spec: &Spec<'_>,
    root: &Command<'_>,
    argv: &[&'v OsStr],
    parse_from: impl FnOnce(&[&'v OsStr]) -> Result<T, Error<'static, 'v>>,
) -> Outcome<T>

Parse one command line without printing or ending the host process.

Pass the CLI’s own parse_from function item:

match usage::embedded::outcome(Cli::spec(), Cli::command(), &argv, Cli::parse_from) {
    usage::embedded::Outcome::Parsed(cli) => run(cli),
    usage::embedded::Outcome::Exit(exit) => host.respond(exit),
}

Help and version go to stdout with status 0. Help produced by arg_required_else_help and parse failures go to stderr with status 2. Rendering follows the terminal attached to the destination stream and honors NO_COLOR and CLICOLOR_FORCE.

The version response uses the portable identity in spec. A CLI whose version or binary name is computed at runtime should handle Error::Version itself so it can use that runtime value.