Code shared from the Rust Playground

playground.rs

fn main() {
    println!("Hello, world!");
}
struct Stack{
	length:u32,
	list:Option<Box<List>>,
}

struct List{
	value:i32,
	next:Option<Box<List>>,
}

impl Stack{
	fn new()->Self{
		Stack{
			length:0,
			list:None,
		}
	}
	fn push(&mut self,value:i32){
		let new_list=Box::new(
			List{
				value:value,
				next:self.list,
			}
		);
		self.list=Some(new_list);
		self.length=self.length+1;
	}
}