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Added warning around code with reference to uninit bytes

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Daniel Henry-Mantilla 2019-09-03 12:17:03 +02:00
parent 815dec9db1
commit 23c76ff7b9
1 changed files with 8 additions and 0 deletions
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8
src/libstd/io/mod.rs
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@ -371,6 +371,14 @@ where
loop { loop {
if g.len == g.buf.len() { if g.len == g.buf.len() {
unsafe { unsafe {
// FIXME(danielhenrymantilla): #42788
//
// - This creates a (mut) reference to a slice of
// _uninitialized integers_.
//
// - This having defined behavior is **unstable**:
// it could become UB in the future,
// at which point it would have be changed.
g.buf.reserve(reservation_size(r)); g.buf.reserve(reservation_size(r));
let capacity = g.buf.capacity(); let capacity = g.buf.capacity();
g.buf.set_len(capacity); g.buf.set_len(capacity);