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// basic tests to see that certain "obvious" errors are caught by
// these types no longer requiring `'static` (RFC 458)
#![allow(dead_code)]
use std::sync::{Mutex, RwLock, mpsc};
fn mutex() {
let x = 1;
let y = Box::new(1);
let lock = Mutex::new(&x);
*lock.lock().unwrap() = &*y;
drop(y); //~ ERROR cannot move out
{
let z = 2;
*lock.lock().unwrap() = &z;
}
//~^^ ERROR `z` does not live long enough
lock.use_ref(); // (Mutex is #[may_dangle] so its dtor does not use `z` => needs explicit use)
}
fn rwlock() {
let x = 1;
let y = Box::new(1);
let lock = RwLock::new(&x);
*lock.write().unwrap() = &*y;
drop(y); //~ ERROR cannot move out
{
let z = 2;
*lock.write().unwrap() = &z;
}
//~^^ ERROR `z` does not live long enough
lock.use_ref(); // (RwLock is #[may_dangle] so its dtor does not use `z` => needs explicit use)
}
fn channel() {
let x = 1;
let y = Box::new(1);
let (tx, rx) = mpsc::channel();
tx.send(&x).unwrap();
tx.send(&*y);
drop(y); //~ ERROR cannot move out
{
let z = 2;
tx.send(&z).unwrap();
}
//~^^ ERROR `z` does not live long enough
// (channels lack #[may_dangle], thus their dtors are implicit uses of `z`)
}
fn main() {}
trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } }
impl<T> Fake for T { }
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