d131f33557
[breaking-change] Technically breaking, since code that had been using these transmutes before will no longer compile. However, it was undefined behavior, so really, it's a good thing. Fixing your code would require some re-working to use an UnsafeCell instead. Closes #13146
21 lines
706 B
Rust
21 lines
706 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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// Tests that transmuting from &T to &mut T is Undefined Behavior.
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use std::mem::transmute;
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fn main() {
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let _a: &mut u8 = unsafe { transmute(&1u8) };
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//~^ ERROR mutating transmuted &mut T from &T may cause undefined behavior
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}
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