nutype_macros 0.6.2

The newtype with guarantees.
Documentation 
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use rustc_version::{Channel, version, version_meta};

fn main() {
    let version = version().expect("Couldn't get Rust version");
    let version_meta = version_meta().expect("Couldn't get Rust channel");

    // Assert we haven't travelled back in time
    assert!(
        version.major >= 1,
        "How did you get a version before 1.0.0?"
    );

    // Generic setting
    println!("cargo:rerun-if-changed=build.rs");

    // feature `error-in-core` landed in rust 1.81.0
    if matches!(version_meta.channel, Channel::Nightly) || version.minor >= 81 {
        println!("cargo:rustc-cfg=ERROR_IN_CORE");
    }
}