3c1ca175d1
Opt-in built-in traits allowed one to explicitly implement both `Drop` and `Copy` for a type. This can theoretically make some sense, but the current implementation means it is codegened totally incorrectly which can lead to memory unsafety, so this feature is disabled for now. Fixes #20126.
31 lines
815 B
Rust
31 lines
815 B
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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#![feature(unsafe_destructor)]
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// issue #20126
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#[derive(Copy)] //~ ERROR the trait `Copy` may not be implemented
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struct Foo;
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impl Drop for Foo {
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fn drop(&mut self) {}
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}
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#[derive(Copy)] //~ ERROR the trait `Copy` may not be implemented
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struct Bar<T>;
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#[unsafe_destructor]
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impl<T> Drop for Bar<T> {
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fn drop(&mut self) {}
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}
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fn main() {}
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