ONCE_INIT is deprecated-in-future only for bootstrap

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/io/util.rs b/src/libstd/io/util.rs
index 20979e02a43..33cc87eb795 100644
--- a/src/libstd/io/util.rs
+++ b/src/libstd/io/util.rs
@@ -48,7 +48,7 @@ pub fn copy<R: ?Sized, W: ?Sized>(reader: &mut R, writer: &mut W) -> io::Result<
     // `MaybeUninit`. Revisit this once we decided whether that is valid or not.
     // This is still technically undefined behavior due to creating a reference
     // to uninitialized data, but within libstd we can rely on more guarantees
-    // than if this code were in an external lib
+    // than if this code were in an external lib.
     unsafe { reader.initializer().initialize(buf.get_mut()); }
 
     let mut written = 0;