Shared via Rust Playground

playground.rs

fn main() {
    let mut p = get_mut();

    for &x in p.iter() {
        print!("{} ", x);
    }
    println!("");
}

fn get_mut<'s>() -> &'s mut Vec<i16> {
    let mut x: Vec<i16> = vec![1, 2, 3];
    for i in x.iter_mut() {
        *i += 1;
    }
    &mut x
}

SUCESS.rs

fn main() {
    let mut p = get_mut();

    while let Some(x) = p.pop() {
        print!("{} ", x);
    }
    println!("");
}

fn get_mut<'s>() -> Vec<i16> {
    let mut x: Vec<i16> = vec![1, 2, 3];
    for i in x.iter_mut() {
        *i += 1;
    }
    x
}

:15:10: 15:11 error: x does not live long enough
:15 &mut x
^
:10:38: 16:2 note: reference must be valid for the lifetime 's as defined on the block at 10:37...
:10 fn get_mut<'s>() -> &'s mut Vec {
:11 let mut x: Vec = vec![1, 2, 3];
:12 for i in x.iter_mut() {
:13 *i += 1;
:14 }
:15 &mut x
...
:11:41: 16:2 note: ...but borrowed value is only valid for the block suffix following statement 0 at 11:40
:11 let mut x: Vec = vec![1, 2, 3];
:12 for i in x.iter_mut() {
:13 *i += 1;
:14 }
:15 &mut x
:16 }
error: aborting due to previous error
playpen: application terminated with error code 101