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Added warning around code with reference to uninit bytes #64123

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Merged
merged 2 commits into from
Sep 5, 2019
Merged

Added warning around code with reference to uninit bytes #64123

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23c76ff
Added warning around code with reference to uninit bytes
Sep 3, 2019
b03d3dc
Changed comment to better reflect std's exceptional situation
Sep 3, 2019
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8 changes: 8 additions & 0 deletions src/libstd/io/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -371,6 +371,14 @@ where
loop {
if g.len == g.buf.len() {
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));
let capacity = g.buf.capacity();
g.buf.set_len(capacity);
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