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#[cfg(feature = "nightly")]
use error_backtrace::nightly::Result;

fn main() -> std::result::Result<(), ()> {
    #[cfg(feature = "nightly")]
    maybe_error().backtrace();

    Ok(())
}

fn maybe_error() -> Result<(), ()> {
    maybe_error2()?;

    Ok(()).into()
}

fn maybe_error2() -> Result<(), ()> {
    error_source()?;

    Ok(()).into()
}

fn error_source() -> Result<(), ()> {
    Err(()).into()
}