haskell_false.rs

#![feature(process_exitcode_placeholder)]
#![feature(never_type)]

use std::process::ExitCode;

fn app() -> Result<!, ()> {
    Err(())
}

fn main() -> ExitCode {
    if app().is_err() {
        ExitCode::FAILURE
    } else {
        ExitCode::SUCCESS
    }
}