Simplified rust ownership problem

main.rs

mod timesheet;

fn main() {
    let mut ts = timesheet::Session::new();
    println!("{:?}", ts);
}

timesheet.rs

#[derive(Debug)]
pub enum Event {
    Pause,
    Meta { text: String },
    Commit { hash: u64 },
}

#[derive(Debug)]
pub struct Session {
    pub id: u64,
    events: Vec<Event>,
}

impl Session {
    pub fn new() -> Session {
        Session {
            id: 0,
            events: Vec::<Event>::new(),
        }
    }
    pub fn append_event(&mut self, e: Event) {
        match e {
            Event::Pause => self.events.push(e),
            Event::Meta { .. } => self.events.push(e),
            Event::Commit { hash } => println!("Commit hash: {}", hash),
        }
    }
}