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autocfg 0.1.1

Automatic cfg for Rust compiler features
Documentation 
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extern crate autocfg;

fn main() {
    // Normally, cargo will set `OUT_DIR` for build scripts.
    let ac = autocfg::AutoCfg::with_dir("target").unwrap();
    for i in 0..100 {
        ac.emit_rustc_version(1, i);
    }
}