Remove the #![feature(io_safety)] from lib.rs.

sunfishcode · sunfishcode · commit 9b99f8c4544e · 2021-08-19T12:02:40.000-07:00
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
@@ -285,7 +285,6 @@
 #![feature(int_log)]
 #![feature(into_future)]
 #![feature(intra_doc_pointers)]
-#![feature(io_safety)]
 #![feature(iter_zip)]
 #![feature(lang_items)]
 #![feature(linkage)]
