Macro env_proc::env_vars

env_vars!() { /* proc-macro */ }

#[macro_use]
extern crate serde_derive;
extern crate serde;
use env_proc::*;
use std::collections::HashMap;
env_vars! {
   NAME = "shane"
}
fn main() {
    let defaults = HmEnv::default();
    assert_eq!(
       defaults.0.get(&EnvVarKeys::Name),
       Some(&String::from("shane"))
    );
}