Deny unsafe ops in unsafe fns, part 6

And final part!!!

Author: LeSeulArtichaut

src/libcore/alloc/mod.rs

@@ -1,7 +1,6 @@
 //! Memory allocation APIs
 
 #![stable(feature = "alloc_module", since = "1.28.0")]
-#![deny(unsafe_op_in_unsafe_fn)]
 
 mod global;
 mod layout;

src/libcore/cell.rs

@@ -187,7 +187,6 @@
 //!
 
 #![stable(feature = "rust1", since = "1.0.0")]
-#![deny(unsafe_op_in_unsafe_fn)]
 
 use crate::cmp::Ordering;
 use crate::fmt::{self, Debug, Display};

src/libcore/char/convert.rs

@@ -1,7 +1,5 @@
 //! Character conversions.
 
-#![deny(unsafe_op_in_unsafe_fn)]
-
 use crate::convert::TryFrom;
 use crate::fmt;
 use crate::mem::transmute;

src/libcore/char/methods.rs

@@ -1,7 +1,5 @@
 //! impl char {}
 
-#![deny(unsafe_op_in_unsafe_fn)]
-
 use crate::slice;
 use crate::str::from_utf8_unchecked_mut;
 use crate::unicode::printable::is_printable;

src/libcore/convert/num.rs

@@ -1,5 +1,3 @@
-#![deny(unsafe_op_in_unsafe_fn)]
-
 use super::{From, TryFrom};
 use crate::num::TryFromIntError;
 

src/libcore/ffi.rs

@@ -1,6 +1,5 @@
 #![stable(feature = "", since = "1.30.0")]
 #![allow(non_camel_case_types)]
-#![deny(unsafe_op_in_unsafe_fn)]
 
 //! Utilities related to FFI bindings.
 

src/libcore/future/mod.rs

@@ -85,5 +85,7 @@ where
 #[unstable(feature = "gen_future", issue = "50547")]
 #[inline]
 pub unsafe fn get_context<'a, 'b>(cx: ResumeTy) -> &'a mut Context<'b> {
-    &mut *cx.0.as_ptr().cast()
+    // SAFETY: the caller must guarantee that `cx.0` is a valid pointer
+    // that fulfills all the requirements for a mutable reference.
+    unsafe { &mut *cx.0.as_ptr().cast() }
 }

src/libcore/hash/sip.rs

@@ -1,7 +1,6 @@
 //! An implementation of SipHash.
 
 #![allow(deprecated)] // the types in this module are deprecated
-#![deny(unsafe_op_in_unsafe_fn)]
 
 use crate::cmp;
 use crate::marker::PhantomData;

src/libcore/hint.rs

@@ -2,8 +2,6 @@
 
 //! Hints to compiler that affects how code should be emitted or optimized.
 
-#![deny(unsafe_op_in_unsafe_fn)]
-
 use crate::intrinsics;
 
 /// Informs the compiler that this point in the code is not reachable, enabling

src/libcore/intrinsics.rs

@@ -53,7 +53,6 @@
     issue = "none"
 )]
 #![allow(missing_docs)]
-#![deny(unsafe_op_in_unsafe_fn)]
 
 use crate::marker::DiscriminantKind;
 use crate::mem;