est 0.7.1

Extensions for the rust Standard library and Tokio.
Documentation 
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use version_check::is_feature_flaggable;

fn main() {
    println!("cargo::rustc-check-cfg=cfg(nightly)");

    if is_feature_flaggable() == Some(true) {
        println!("cargo:rustc-cfg=nightly");
    }
}