vergen-gitcl 9.1.0

Generate 'cargo:rustc-env' instructions via 'build.rs' for use in your code via the 'env!' macro
Documentation 
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pub fn main() {
    println!("cargo:rerun-if-changed=build.rs");
    nightly();
}

#[rustversion::nightly]
fn nightly() {
    println!("cargo:rustc-check-cfg=cfg(nightly)");
    println!("cargo:rustc-cfg=nightly");
}

#[rustversion::not(nightly)]
fn nightly() {
    println!("cargo:rustc-check-cfg=cfg(nightly)");
}