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lint: deny transmuting from immutable to mutable, since it's undefine…
…d behavior [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
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// 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. | ||
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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() { | ||
let _a: &mut u8 = unsafe { transmute(&1u8) }; | ||
//~^ ERROR mutating transmuted &mut T from &T may cause undefined behavior | ||
} | ||
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