55 lines
1.1 KiB
Rust
55 lines
1.1 KiB
Rust
|
// check-pass
|
||
|
|
|
||
|
|
use std::fmt::{self, Display};
|
||
|
|
|
||
|
|
struct Mutex;
|
||
|
|
|
||
|
|
impl Mutex {
|
||
|
|
fn lock(&self) -> MutexGuard {
|
||
|
|
MutexGuard(self)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct MutexGuard<'a>(&'a Mutex);
|
||
|
|
|
||
|
|
impl<'a> Drop for MutexGuard<'a> {
|
||
|
|
fn drop(&mut self) {
|
||
|
|
// Empty but this is a necessary part of the repro. Otherwise borrow
|
||
|
|
// checker is fine with 'a dangling at the time that MutexGuard goes out
|
||
|
|
// of scope.
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<'a> Display for MutexGuard<'a> {
|
||
|
|
fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
|
||
|
|
Ok(())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let _print = {
|
||
|
|
let mutex = Mutex;
|
||
|
|
print!("{}", mutex.lock()) /* no semicolon */
|
||
|
|
};
|
||
|
|
|
||
|
|
let _println = {
|
||
|
|
let mutex = Mutex;
|
||
|
|
println!("{}", mutex.lock()) /* no semicolon */
|
||
|
|
};
|
||
|
|
|
||
|
|
let _eprint = {
|
||
|
|
let mutex = Mutex;
|
||
|
|
eprint!("{}", mutex.lock()) /* no semicolon */
|
||
|
|
};
|
||
|
|
|
||
|
|
let _eprintln = {
|
||
|
|
let mutex = Mutex;
|
||
|
|
eprintln!("{}", mutex.lock()) /* no semicolon */
|
||
|
|
};
|
||
|
|
|
||
|
|
let _panic = {
|
||
|
|
let mutex = Mutex;
|
||
|
|
panic!("{}", mutex.lock()) /* no semicolon */
|
||
|
|
};
|
||
|
|
}
|