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clarify write_bytes a bit

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This commit is contained in:
Ralf Jung 2018-09-21 16:01:58 +02:00
parent adcc0d2168
commit c197dc467f
1 changed files with 4 additions and 0 deletions
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4
src/libcore/intrinsics.rs
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@ -1162,6 +1162,10 @@ extern "rust-intrinsic" {
/// // Even leaking `v` "uses" it, and hence is undefined behavior. /// // Even leaking `v` "uses" it, and hence is undefined behavior.
/// // mem::forget(v); // ERROR /// // mem::forget(v); // ERROR
/// ///
/// // In fact, `v` is invalid according to basic type layout invariants, so *any*
/// // operation touching it is undefined behavior.
/// // let v2 = v; // ERROR
///
/// unsafe { /// unsafe {
/// // Let us instead put in a valid value /// // Let us instead put in a valid value
/// ptr::write(&mut v as *mut Box<i32>, Box::new(42i32)); /// ptr::write(&mut v as *mut Box<i32>, Box::new(42i32));