39 lines
1.1 KiB
Rust
39 lines
1.1 KiB
Rust
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// 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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// Check that one cannot subvert Drop Check rule via a user-defined
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// Clone implementation.
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#![allow(unused_variables, unused_assignments)]
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struct D<T:Copy>(T, &'static str);
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#[derive(Copy)]
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struct S<'a>(&'a D<i32>, &'static str);
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impl<'a> Clone for S<'a> {
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fn clone(&self) -> S<'a> {
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println!("cloning `S(_, {})` and thus accessing: {}", self.1, (self.0).0);
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S(self.0, self.1)
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}
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}
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impl<T:Copy> Drop for D<T> {
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fn drop(&mut self) {
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println!("calling Drop for {}", self.1);
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let _call = self.0.clone();
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}
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}
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fn main() {
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let (d2, d1);
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d1 = D(34, "d1");
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d2 = D(S(&d1, "inner"), "d2"); //~ ERROR `d1` does not live long enough
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}
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