1 files changed, 16 insertions, 5 deletions
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index a50dd9575de..88d556229e4 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -371,7 +371,7 @@ where
     F: FnMut(&R) -> usize,
 {
     let start_len = buf.len();
-    let mut g = Guard { len: buf.len(), buf: buf };
+    let mut g = Guard { len: buf.len(), buf };
     let ret;
     loop {
         if g.len == g.buf.len() {
@@ -497,13 +497,12 @@ where
 /// [`&str`]: ../../std/primitive.str.html
 /// [slice]: ../../std/primitive.slice.html
 #[stable(feature = "rust1", since = "1.0.0")]
-#[doc(spotlight)]
 pub trait Read {
     /// Pull some bytes from this source into the specified buffer, returning
     /// how many bytes were read.
     ///
     /// This function does not provide any guarantees about whether it blocks
-    /// waiting for data, but if an object needs to block for a read but cannot
+    /// waiting for data, but if an object needs to block for a read and cannot,
     /// it will typically signal this via an [`Err`] return value.
     ///
     /// If the return value of this method is [`Ok(n)`], then it must be
@@ -939,7 +938,7 @@ pub trait Read {
     where
         Self: Sized,
     {
-        Take { inner: self, limit: limit }
+        Take { inner: self, limit }
     }
 }
 
@@ -952,6 +951,12 @@ pub trait Read {
 #[repr(transparent)]
 pub struct IoSliceMut<'a>(sys::io::IoSliceMut<'a>);
 
+#[stable(feature = "iovec-send-sync", since = "1.44.0")]
+unsafe impl<'a> Send for IoSliceMut<'a> {}
+
+#[stable(feature = "iovec-send-sync", since = "1.44.0")]
+unsafe impl<'a> Sync for IoSliceMut<'a> {}
+
 #[stable(feature = "iovec", since = "1.36.0")]
 impl<'a> fmt::Debug for IoSliceMut<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -1051,9 +1056,16 @@ impl<'a> DerefMut for IoSliceMut<'a> {
 /// ABI compatible with the `iovec` type on Unix platforms and `WSABUF` on
 /// Windows.
 #[stable(feature = "iovec", since = "1.36.0")]
+#[derive(Copy, Clone)]
 #[repr(transparent)]
 pub struct IoSlice<'a>(sys::io::IoSlice<'a>);
 
+#[stable(feature = "iovec-send-sync", since = "1.44.0")]
+unsafe impl<'a> Send for IoSlice<'a> {}
+
+#[stable(feature = "iovec-send-sync", since = "1.44.0")]
+unsafe impl<'a> Sync for IoSlice<'a> {}
+
 #[stable(feature = "iovec", since = "1.36.0")]
 impl<'a> fmt::Debug for IoSlice<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -1228,7 +1240,6 @@ impl Initializer {
 ///
 /// [`write_all`]: #method.write_all
 #[stable(feature = "rust1", since = "1.0.0")]
-#[doc(spotlight)]
 pub trait Write {
     /// Write a buffer into this writer, returning how many bytes were written.
     ///