Code shared from the Rust Playground

playground.rs

#![allow(warnings)]

#[macro_use]
extern crate lazy_static; // 1.1.0

use lazy_static::LazyStatic;

struct MyFoo {}

impl MyFoo {
    pub fn initialize(&self) {
        println!("MyFoo instance is being initialized!");
    }
}

lazy_static! {
    static ref MY_FOO: MyFoo = {
        println!("MY_FOO is being initialized!");
        MyFoo{}
    };
}

fn main() {
    // LazyStatic::initialize(&MY_FOO);
    
    MY_FOO.initialize();
}