exit_safely 0.3.3

exit safely with custom exit codes while still calling `Drop` as needed. Aims for minimal magic and maximum flexibilty.
Documentation 
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use ninja_build_rs::{
    Result,
    nightly::{Nightly, cargo_allowed_features},
};

fn main() -> Result<()> {
    let mut ac = autocfg::new();
    ac.set_edition(Some("2024".to_string()));

    let allowed_features = cargo_allowed_features()?;
    ac.emit_unstable_feature("proc_macro_diagnostic", &allowed_features);
    ac.emit_unstable_feature("never_type", &allowed_features);
    ac.emit_unstable_feature("try_trait_v2", &allowed_features);
    ac.emit_unstable_feature("try_trait_v2_residual", &allowed_features);

    Ok(())
}