| // 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 |
