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num-rational 0.4.0

Rational numbers implementation for Rust
Documentation 
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fn main() {
    let ac = autocfg::new();
    if ac.probe_expression("format!(\"{:e}\", 0_isize)") {
        println!("cargo:rustc-cfg=has_int_exp_fmt");
    }

    autocfg::rerun_path("build.rs");
}