proc-macro2-diagnostics 0.10.1

Diagnostics for proc-macro2.
Documentation 
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fn main() {
    if let Some((version, channel, _)) = version_check::triple() {
        if version.at_least("1.31.0") && channel.supports_features() {
            println!("cargo:rustc-cfg=nightly_diagnostics");
        }
    }
}