#[rustversion::nightly]
fn nightly() {
println!("cargo::rustc-cfg=nightly");
}
#[rustversion::not(nightly)]
fn nightly() {}
fn main() {
nightly();
println!("cargo::rustc-check-cfg=cfg(nightly)");
#[cfg(not(feature = "panic_hook"))]
println!(
"cargo::warning=`panic_hook` feature disabled, panicking without this feature enabled is instant UB"
);
}