RustVis Presentation Tests

Nested scopes

Nested scopes of the same type

Spans with gaps in them
            

Nested scopes

Nested scopes of the same type

Spans with gaps in them
            

use std::collections::HashMap;

fn usage<T>(x: T) {}

fn main() {
    let mut target = HashMap::new();
    let key = String::from("foo");
    let value = {
        let map_ref1 = &mut target;
        match map_ref1.get_mut(&key) {
            Some(value) => value,
            None => {
                target.insert(key.clone(), 5);
                let map_ref2 = &mut target;
                map_ref2.get_mut(&key).unwrap()
            }
        }
    };
    usage(value);
    // potentially more code
​}

struct Foo;

fn max<'a>(x: &'a Foo, y: &'a Foo) -> &'a Foo {
    x
}

fn main() {
    let a = Foo;
    let y: &Foo;
    {
        let target = Foo;
        y = max(&a, &target);
        // error: `target` does not live long enough
    }
    // potentially more code
​}