nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2025-01-23 21:23:20 +00:00
Code Issues Packages Projects Releases Wiki Activity

Read: adjust a FIXME reference

Browse Source
This commit is contained in:
Ralf Jung 2020-09-02 12:34:15 +02:00
parent e88e908e66
commit 0af3bd01df
1 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
library/std/src/io/util.rs
View File

@ -52,11 +52,14 @@ where
W: Write, W: Write,
{ {
let mut buf = MaybeUninit::<[u8; super::DEFAULT_BUF_SIZE]>::uninit(); let mut buf = MaybeUninit::<[u8; super::DEFAULT_BUF_SIZE]>::uninit();
// FIXME(#76092): This is calling `get_mut` and `get_ref` on an uninitialized // FIXME: #42788
// `MaybeUninit`. Revisit this once we decided whether that is valid or not. //
// This is still technically undefined behavior due to creating a reference // - This creates a (mut) reference to a slice of
// to uninitialized data, but within libstd we can rely on more guarantees // _uninitialized_ integers, which is **undefined behavior**
// than if this code were in an external lib. //
// - Only the standard library gets to soundly "ignore" this,
// based on its privileged knowledge of unstable rustc
// internals;
unsafe { unsafe {
reader.initializer().initialize(buf.assume_init_mut()); reader.initializer().initialize(buf.assume_init_mut());
} }