test_data_passing_crate 0.1.0

Used by https://github.com/bazelbuild/rules_rust to test cargo emulation
Documentation 
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fn main() {
    println!(
        "cargo:rustc-env=BUILD_SCRIPT_OPT_LEVEL={}",
        std::env::var("OPT_LEVEL").unwrap()
    );
    println!(
        "cargo:rustc-env=BUILD_SCRIPT_OUT_DIR={}",
        std::env::var("OUT_DIR").unwrap()
    );
}