Documentation
1
2
3
4
5
6
7
8
fn main() {
    println!("cargo:rerun-if-changed=build.rs");

    if rustc_version::version_meta().unwrap().channel == rustc_version::Channel::Nightly {
        println!("cargo:rustc-cfg=nightly");
    }
    println!("cargo::rustc-check-cfg=cfg(nightly)");
}