| #![feature(dropck_eyepatch)] |
| |
| // This is a support file for ../dropck-eyepatch-extern-crate.rs |
| // |
| // The point of this test is to illustrate that the `#[may_dangle]` |
| // attribute specifically allows, in the context of a type |
| // implementing `Drop`, a generic parameter to be instantiated with a |
| // lifetime that does not strictly outlive the owning type itself, |
| // and that this attribute's effects are preserved when importing |
| // the type from another crate. |
| // |
| // See also ../dropck-eyepatch.rs for more information about the general |
| // structure of the test. |
| |
| use std::fmt; |
| |
| pub struct Dt<A: fmt::Debug>(pub &'static str, pub A); |
| pub struct Dr<'a, B:'a+fmt::Debug>(pub &'static str, pub &'a B); |
| pub struct Pt<A,B: fmt::Debug>(pub &'static str, pub A, pub B); |
| pub struct Pr<'a, 'b, B:'a+'b+fmt::Debug>(pub &'static str, pub &'a B, pub &'b B); |
| pub struct St<A: fmt::Debug>(pub &'static str, pub A); |
| pub struct Sr<'a, B:'a+fmt::Debug>(pub &'static str, pub &'a B); |
| |
| impl<A: fmt::Debug> Drop for Dt<A> { |
| fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); } |
| } |
| impl<'a, B: fmt::Debug> Drop for Dr<'a, B> { |
| fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); } |
| } |
| unsafe impl<#[may_dangle] A, B: fmt::Debug> Drop for Pt<A, B> { |
| // (unsafe to access self.1 due to #[may_dangle] on A) |
| fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); } |
| } |
| unsafe impl<#[may_dangle] 'a, 'b, B: fmt::Debug> Drop for Pr<'a, 'b, B> { |
| // (unsafe to access self.1 due to #[may_dangle] on 'a) |
| fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); } |
| } |
