fn main() {
    // Things it should warn about:
    std::process::Command::new("echo").args(["-n", "hello"]).spawn().unwrap();
    std::process::Command::new("cat").args(["--number", "file"]).spawn().unwrap();

    // Things it should not warn about:
    std::process::Command::new("echo").arg("hello world").spawn().unwrap();
    std::process::Command::new("a").arg("--fmt=%a %b %c").spawn().unwrap();
    std::process::Command::new("b").arg("-ldflags=-s -w").spawn().unwrap();
}