range-set-blaze 0.4.1

Integer sets as fast, sorted integer ranges; Maps with integer-range keys; Full set operations
Documentation 
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//! This build script reads the `BUILDFEATURES` environment variable and sets
use std::env;

fn main() {
    if let Ok(features) = env::var("BUILDFEATURES") {
        for feature in features.split(',') {
            println!("cargo:rustc-cfg=feature=\"{}\"", feature.trim());
            println!("cargo:rerun-if-env-changed=BUILDFEATURES");
        }
    }
}