use std::future::Future;


pub struct Foo {}

impl Foo {
    pub async fn bar(&self) -> Result<i32, ()> {
        Ok(42)
    }
}


// Can't use async-std in playground, so here's a shim
pub fn spawn<F, T>(_future: F) where
    F: Future<Output = T> + Send + 'static,
    T: Send + 'static {
    unimplemented!();
}

fn main() {
    let x = Foo {};
    spawn(x.bar());
}