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