mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 15:23:46 +00:00
30 lines
691 B
Rust
30 lines
691 B
Rust
// Check that one cannot subvert Drop Check rule via a user-defined
|
|
// Clone implementation.
|
|
|
|
#![allow(unused_variables, unused_assignments)]
|
|
|
|
struct D<T:Copy>(T, &'static str);
|
|
|
|
#[derive(Copy)]
|
|
struct S<'a>(&'a D<i32>, &'static str);
|
|
impl<'a> Clone for S<'a> {
|
|
fn clone(&self) -> S<'a> {
|
|
println!("cloning `S(_, {})` and thus accessing: {}", self.1, (self.0).0);
|
|
S(self.0, self.1)
|
|
}
|
|
}
|
|
|
|
impl<T:Copy> Drop for D<T> {
|
|
fn drop(&mut self) {
|
|
println!("calling Drop for {}", self.1);
|
|
let _call = self.0.clone();
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let (d2, d1);
|
|
d1 = D(34, "d1");
|
|
d2 = D(S(&d1, "inner"), "d2");
|
|
}
|
|
//~^^ ERROR `d1` does not live long enough
|