Rust Compile Time Macros 001

This takes the PATH variable, as it was when the binary was compiled. This does not fetch the PATH variable at runtime. This is why it can be a const fn.

use std;

const fn mac() -> &'static str {
    let path: &'static str = std::env!("PATH");
    path
}

fn main() {
    println!("{}",mac());
}