49 lines
1.6 KiB
Rust
49 lines
1.6 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Demonstrate that having a lifetime param causes dropck to reject code
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// that might indirectly access previously dropped value.
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//
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// Compare with run-pass/issue28498-ugeh-with-lifetime-param.rs
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#[derive(Debug)]
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struct ScribbleOnDrop(String);
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impl Drop for ScribbleOnDrop {
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fn drop(&mut self) {
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self.0 = format!("DROPPED");
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}
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}
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struct Foo<'a>(u32, &'a ScribbleOnDrop);
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impl<'a> Drop for Foo<'a> {
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fn drop(&mut self) {
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// Use of `unsafe_destructor_blind_to_params` is unsound,
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// because destructor accesses borrowed data in `self.1`
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// and we must force that to strictly outlive `self`.
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println!("Dropping Foo({}, {:?})", self.0, self.1);
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}
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}
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fn main() {
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let (last_dropped, foo0);
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let (foo1, first_dropped);
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last_dropped = ScribbleOnDrop(format!("last"));
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first_dropped = ScribbleOnDrop(format!("first"));
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foo0 = Foo(0, &last_dropped);
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//~^ ERROR `last_dropped` does not live long enough
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foo1 = Foo(1, &first_dropped);
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//~^ ERROR `first_dropped` does not live long enough
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println!("foo0.1: {:?} foo1.1: {:?}", foo0.1, foo1.1);
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}
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