struct Guard;

impl Drop for Guard {
    fn drop(&mut self) {
        println!("Dropped");
    }
}

impl Guard {
    pub fn get(&self) -> Option<bool> {
        Some(true)
    }
    pub fn get_none(&self) -> Option<bool> {
        None
    }
}

fn main() {

    if let Some(_) = Guard.get() {
        println!("Inside IF 1");
    }
    println!("------------");
    if let Some(_) = { Guard.get() } {
        println!("Inside IF 2");
    }
    println!("------------");
    match { Guard.get() } {
        Some(_) => { println!("Inside Match"); }
        _ => ()
    }
    println!("------------");
    if Guard.get().is_some() {
        println!("Inside IF 4");
    }
    println!("------------");
    let x = { Guard.get() };
    if let Some(_) = x {
        println!("Inside IF 5");
    }
    println!("------------");
    if let Some(_) = Guard.get_none() {
        println!("Inside IF 6 in then, never go there");
    } else {
        println!("Inside IF 6 in else");
    }

}