num-bigint-dig 0.5.0

Big integer implementation for Rust
Documentation 
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extern crate autocfg;
use std::env;

fn main() {
    let ac = autocfg::new();

    if ac.probe_type("i128") {
        println!("cargo:rustc-cfg=has_i128");
    } else if env::var_os("CARGO_FEATURE_I128").is_some() {
        panic!("i128 support was not detected!");
    }
}