--- /dev/null
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Demonstrate that having a lifetime param causes dropck to reject code
+// that might indirectly access previously dropped value.
+//
+// Compare with run-pass/issue28498-ugeh-with-lifetime-param.rs
+
+#[derive(Debug)]
+struct ScribbleOnDrop(String);
+
+impl Drop for ScribbleOnDrop {
+ fn drop(&mut self) {
+ self.0 = format!("DROPPED");
+ }
+}
+
+struct Foo<'a>(u32, &'a ScribbleOnDrop);
+
+impl<'a> Drop for Foo<'a> {
+ fn drop(&mut self) {
+ // Use of `unsafe_destructor_blind_to_params` is unsound,
+ // because destructor accesses borrowed data in `self.1`
+ // and we must force that to strictly outlive `self`.
+ println!("Dropping Foo({}, {:?})", self.0, self.1);
+ }
+}
+
+fn main() {
+ let (last_dropped, foo0);
+ let (foo1, first_dropped);
+
+ last_dropped = ScribbleOnDrop(format!("last"));
+ first_dropped = ScribbleOnDrop(format!("first"));
+ foo0 = Foo(0, &last_dropped);
+ //~^ ERROR `last_dropped` does not live long enough
+ foo1 = Foo(1, &first_dropped);
+ //~^ ERROR `first_dropped` does not live long enough
+
+ println!("foo0.1: {:?} foo1.1: {:?}", foo0.1, foo1.1);
+}
--- /dev/null
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Demonstrate the use of the unguarded escape hatch with a lifetime param
+// to assert that destructor will not access any dead data.
+//
+// Compare with compile-fail/issue28498-reject-lifetime-param.rs
+
+#![feature(dropck_parametricity)]
+
+#[derive(Debug)]
+struct ScribbleOnDrop(String);
+
+impl Drop for ScribbleOnDrop {
+ fn drop(&mut self) {
+ self.0 = format!("DROPPED");
+ }
+}
+
+struct Foo<'a>(u32, &'a ScribbleOnDrop);
+
+impl<'a> Drop for Foo<'a> {
+ #[unsafe_destructor_blind_to_params]
+ fn drop(&mut self) {
+ // Use of `unsafe_destructor_blind_to_params` is sound,
+ // because destructor never accesses `self.1`.
+ println!("Dropping Foo({}, _)", self.0);
+ }
+}
+
+fn main() {
+ let (last_dropped, foo0);
+ let (foo1, first_dropped);
+
+ last_dropped = ScribbleOnDrop(format!("last"));
+ first_dropped = ScribbleOnDrop(format!("first"));
+ foo0 = Foo(0, &last_dropped);
+ foo1 = Foo(1, &first_dropped);
+
+ println!("foo0.1: {:?} foo1.1: {:?}", foo0.1, foo1.1);
+}