Rename alloc::Void to alloc::Opaque

src/doc/nomicon

@@ -1 +1 @@
-Subproject commit 498ac2997420f7b25f7cd0a3f8202950d8ad93ec
+Subproject commit 3c56329d1bd9038e5341f1962bcd8d043312a712

src/doc/unstable-book/src/language-features/global-allocator.md

@@ -29,17 +29,17 @@ looks like:
 ```rust
 #![feature(global_allocator, allocator_api, heap_api)]
 
-use std::alloc::{GlobalAlloc, System, Layout, Void};
+use std::alloc::{GlobalAlloc, System, Layout, Opaque};
 use std::ptr::NonNull;
 
 struct MyAllocator;
 
 unsafe impl GlobalAlloc for MyAllocator {
-    unsafe fn alloc(&self, layout: Layout) -> *mut Void {
+    unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
         System.alloc(layout)
     }
 
-    unsafe fn dealloc(&self, ptr: *mut Void, layout: Layout) {
+    unsafe fn dealloc(&self, ptr: *mut Opaque, layout: Layout) {
         System.dealloc(ptr, layout)
     }
 }

src/liballoc/alloc.rs

@@ -76,36 +76,36 @@ pub const Heap: Global = Global;
 
 unsafe impl GlobalAlloc for Global {
     #[inline]
-    unsafe fn alloc(&self, layout: Layout) -> *mut Void {
+    unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
         #[cfg(not(stage0))]
         let ptr = __rust_alloc(layout.size(), layout.align());
         #[cfg(stage0)]
         let ptr = __rust_alloc(layout.size(), layout.align(), &mut 0);
-        ptr as *mut Void
+        ptr as *mut Opaque
     }
 
     #[inline]
-    unsafe fn dealloc(&self, ptr: *mut Void, layout: Layout) {
+    unsafe fn dealloc(&self, ptr: *mut Opaque, layout: Layout) {
         __rust_dealloc(ptr as *mut u8, layout.size(), layout.align())
     }
 
     #[inline]
-    unsafe fn realloc(&self, ptr: *mut Void, layout: Layout, new_size: usize) -> *mut Void {
+    unsafe fn realloc(&self, ptr: *mut Opaque, layout: Layout, new_size: usize) -> *mut Opaque {
         #[cfg(not(stage0))]
         let ptr = __rust_realloc(ptr as *mut u8, layout.size(), layout.align(), new_size);
         #[cfg(stage0)]
         let ptr = __rust_realloc(ptr as *mut u8, layout.size(), layout.align(),
                                  new_size, layout.align(), &mut 0);
-        ptr as *mut Void
+        ptr as *mut Opaque
     }
 
     #[inline]
-    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Void {
+    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Opaque {
         #[cfg(not(stage0))]
         let ptr = __rust_alloc_zeroed(layout.size(), layout.align());
         #[cfg(stage0)]
         let ptr = __rust_alloc_zeroed(layout.size(), layout.align(), &mut 0);
-        ptr as *mut Void
+        ptr as *mut Opaque
     }
 
     #[inline]
@@ -121,27 +121,27 @@ unsafe impl GlobalAlloc for Global {
 
 unsafe impl Alloc for Global {
     #[inline]
-    unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr> {
+    unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
         NonNull::new(GlobalAlloc::alloc(self, layout)).ok_or(AllocErr)
     }
 
     #[inline]
-    unsafe fn dealloc(&mut self, ptr: NonNull<Void>, layout: Layout) {
+    unsafe fn dealloc(&mut self, ptr: NonNull<Opaque>, layout: Layout) {
         GlobalAlloc::dealloc(self, ptr.as_ptr(), layout)
     }
 
     #[inline]
     unsafe fn realloc(&mut self,
-                      ptr: NonNull<Void>,
+                      ptr: NonNull<Opaque>,
                       layout: Layout,
                       new_size: usize)
-                      -> Result<NonNull<Void>, AllocErr>
+                      -> Result<NonNull<Opaque>, AllocErr>
     {
         NonNull::new(GlobalAlloc::realloc(self, ptr.as_ptr(), layout, new_size)).ok_or(AllocErr)
     }
 
     #[inline]
-    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr> {
+    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
         NonNull::new(GlobalAlloc::alloc_zeroed(self, layout)).ok_or(AllocErr)
     }
 
@@ -178,7 +178,7 @@ pub(crate) unsafe fn box_free<T: ?Sized>(ptr: *mut T) {
     // We do not allocate for Box<T> when T is ZST, so deallocation is also not necessary.
     if size != 0 {
         let layout = Layout::from_size_align_unchecked(size, align);
-        Global.dealloc(ptr as *mut Void, layout);
+        Global.dealloc(ptr as *mut Opaque, layout);
     }
 }
 

src/liballoc/arc.rs

@@ -518,7 +518,7 @@ impl<T: ?Sized> Arc<T> {
 
         if self.inner().weak.fetch_sub(1, Release) == 1 {
             atomic::fence(Acquire);
-            Global.dealloc(self.ptr.as_void(), Layout::for_value(self.ptr.as_ref()))
+            Global.dealloc(self.ptr.as_opaque(), Layout::for_value(self.ptr.as_ref()))
         }
     }
 
@@ -637,7 +637,7 @@ impl<T: Clone> ArcFromSlice<T> for Arc<[T]> {
                     let slice = from_raw_parts_mut(self.elems, self.n_elems);
                     ptr::drop_in_place(slice);
 
-                    Global.dealloc(self.mem.as_void(), self.layout.clone());
+                    Global.dealloc(self.mem.as_opaque(), self.layout.clone());
                 }
             }
         }
@@ -1156,7 +1156,7 @@ impl<T: ?Sized> Drop for Weak<T> {
         if self.inner().weak.fetch_sub(1, Release) == 1 {
             atomic::fence(Acquire);
             unsafe {
-                Global.dealloc(self.ptr.as_void(), Layout::for_value(self.ptr.as_ref()))
+                Global.dealloc(self.ptr.as_opaque(), Layout::for_value(self.ptr.as_ref()))
             }
         }
     }

src/liballoc/btree/node.rs

@@ -249,7 +249,7 @@ impl<K, V> Root<K, V> {
         self.as_mut().as_leaf_mut().parent = ptr::null();
 
         unsafe {
-            Global.dealloc(NonNull::from(top).as_void(), Layout::new::<InternalNode<K, V>>());
+            Global.dealloc(NonNull::from(top).as_opaque(), Layout::new::<InternalNode<K, V>>());
         }
     }
 }
@@ -435,7 +435,7 @@ impl<K, V> NodeRef<marker::Owned, K, V, marker::Leaf> {
     > {
         let node = self.node;
         let ret = self.ascend().ok();
-        Global.dealloc(node.as_void(), Layout::new::<LeafNode<K, V>>());
+        Global.dealloc(node.as_opaque(), Layout::new::<LeafNode<K, V>>());
         ret
     }
 }
@@ -456,7 +456,7 @@ impl<K, V> NodeRef<marker::Owned, K, V, marker::Internal> {
     > {
         let node = self.node;
         let ret = self.ascend().ok();
-        Global.dealloc(node.as_void(), Layout::new::<InternalNode<K, V>>());
+        Global.dealloc(node.as_opaque(), Layout::new::<InternalNode<K, V>>());
         ret
     }
 }
@@ -1239,12 +1239,12 @@ impl<'a, K, V> Handle<NodeRef<marker::Mut<'a>, K, V, marker::Internal>, marker::
                 }
 
                 Global.dealloc(
-                    right_node.node.as_void(),
+                    right_node.node.as_opaque(),
                     Layout::new::<InternalNode<K, V>>(),
                 );
             } else {
                 Global.dealloc(
-                    right_node.node.as_void(),
+                    right_node.node.as_opaque(),
                     Layout::new::<LeafNode<K, V>>(),
                 );
             }

src/liballoc/heap.rs

@@ -10,7 +10,7 @@
 
 #![allow(deprecated)]
 
-pub use alloc::{Layout, AllocErr, CannotReallocInPlace, Void};
+pub use alloc::{Layout, AllocErr, CannotReallocInPlace, Opaque};
 use core::alloc::Alloc as CoreAlloc;
 use core::ptr::NonNull;
 
@@ -54,7 +54,7 @@ unsafe impl<T> Alloc for T where T: CoreAlloc {
     }
 
     unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) {
-        let ptr = NonNull::new_unchecked(ptr as *mut Void);
+        let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
         CoreAlloc::dealloc(self, ptr, layout)
     }
 
@@ -70,7 +70,7 @@ unsafe impl<T> Alloc for T where T: CoreAlloc {
                       ptr: *mut u8,
                       layout: Layout,
                       new_layout: Layout) -> Result<*mut u8, AllocErr> {
-        let ptr = NonNull::new_unchecked(ptr as *mut Void);
+        let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
         CoreAlloc::realloc(self, ptr, layout, new_layout.size()).map(|ptr| ptr.cast().as_ptr())
     }
 
@@ -87,7 +87,7 @@ unsafe impl<T> Alloc for T where T: CoreAlloc {
                              ptr: *mut u8,
                              layout: Layout,
                              new_layout: Layout) -> Result<Excess, AllocErr> {
-        let ptr = NonNull::new_unchecked(ptr as *mut Void);
+        let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
         CoreAlloc::realloc_excess(self, ptr, layout, new_layout.size())
             .map(|e| Excess(e.0 .cast().as_ptr(), e.1))
     }
@@ -96,7 +96,7 @@ unsafe impl<T> Alloc for T where T: CoreAlloc {
                             ptr: *mut u8,
                             layout: Layout,
                             new_layout: Layout) -> Result<(), CannotReallocInPlace> {
-        let ptr = NonNull::new_unchecked(ptr as *mut Void);
+        let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
         CoreAlloc::grow_in_place(self, ptr, layout, new_layout.size())
     }
 
@@ -104,7 +104,7 @@ unsafe impl<T> Alloc for T where T: CoreAlloc {
                               ptr: *mut u8,
                               layout: Layout,
                               new_layout: Layout) -> Result<(), CannotReallocInPlace> {
-        let ptr = NonNull::new_unchecked(ptr as *mut Void);
+        let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
         CoreAlloc::shrink_in_place(self, ptr, layout, new_layout.size())
     }
 }

src/liballoc/raw_vec.rs

@@ -90,7 +90,7 @@ impl<T, A: Alloc> RawVec<T, A> {
 
             // handles ZSTs and `cap = 0` alike
             let ptr = if alloc_size == 0 {
-                NonNull::<T>::dangling().as_void()
+                NonNull::<T>::dangling().as_opaque()
             } else {
                 let align = mem::align_of::<T>();
                 let result = if zeroed {
@@ -310,7 +310,7 @@ impl<T, A: Alloc> RawVec<T, A> {
                     let new_cap = 2 * self.cap;
                     let new_size = new_cap * elem_size;
                     alloc_guard(new_size).expect("capacity overflow");
-                    let ptr_res = self.a.realloc(NonNull::from(self.ptr).as_void(),
+                    let ptr_res = self.a.realloc(NonNull::from(self.ptr).as_opaque(),
                                                  cur,
                                                  new_size);
                     match ptr_res {
@@ -369,7 +369,7 @@ impl<T, A: Alloc> RawVec<T, A> {
             let new_cap = 2 * self.cap;
             let new_size = new_cap * elem_size;
             alloc_guard(new_size).expect("capacity overflow");
-            match self.a.grow_in_place(NonNull::from(self.ptr).as_void(), old_layout, new_size) {
+            match self.a.grow_in_place(NonNull::from(self.ptr).as_opaque(), old_layout, new_size) {
                 Ok(_) => {
                     // We can't directly divide `size`.
                     self.cap = new_cap;
@@ -426,7 +426,7 @@ impl<T, A: Alloc> RawVec<T, A> {
             let res = match self.current_layout() {
                 Some(layout) => {
                     debug_assert!(new_layout.align() == layout.align());
-                    self.a.realloc(NonNull::from(self.ptr).as_void(), layout, new_layout.size())
+                    self.a.realloc(NonNull::from(self.ptr).as_opaque(), layout, new_layout.size())
                 }
                 None => self.a.alloc(new_layout),
             };
@@ -535,7 +535,7 @@ impl<T, A: Alloc> RawVec<T, A> {
             let res = match self.current_layout() {
                 Some(layout) => {
                     debug_assert!(new_layout.align() == layout.align());
-                    self.a.realloc(NonNull::from(self.ptr).as_void(), layout, new_layout.size())
+                    self.a.realloc(NonNull::from(self.ptr).as_opaque(), layout, new_layout.size())
                 }
                 None => self.a.alloc(new_layout),
             };
@@ -601,7 +601,7 @@ impl<T, A: Alloc> RawVec<T, A> {
             // FIXME: may crash and burn on over-reserve
             alloc_guard(new_layout.size()).expect("capacity overflow");
             match self.a.grow_in_place(
-                NonNull::from(self.ptr).as_void(), old_layout, new_layout.size(),
+                NonNull::from(self.ptr).as_opaque(), old_layout, new_layout.size(),
             ) {
                 Ok(_) => {
                     self.cap = new_cap;
@@ -662,7 +662,7 @@ impl<T, A: Alloc> RawVec<T, A> {
                 let new_size = elem_size * amount;
                 let align = mem::align_of::<T>();
                 let old_layout = Layout::from_size_align_unchecked(old_size, align);
-                match self.a.realloc(NonNull::from(self.ptr).as_void(),
+                match self.a.realloc(NonNull::from(self.ptr).as_opaque(),
                                      old_layout,
                                      new_size) {
                     Ok(p) => self.ptr = p.cast().into(),
@@ -698,7 +698,7 @@ impl<T, A: Alloc> RawVec<T, A> {
         let elem_size = mem::size_of::<T>();
         if elem_size != 0 {
             if let Some(layout) = self.current_layout() {
-                self.a.dealloc(NonNull::from(self.ptr).as_void(), layout);
+                self.a.dealloc(NonNull::from(self.ptr).as_opaque(), layout);
             }
         }
     }
@@ -734,7 +734,7 @@ fn alloc_guard(alloc_size: usize) -> Result<(), CollectionAllocErr> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use alloc::Void;
+    use alloc::Opaque;
 
     #[test]
     fn allocator_param() {
@@ -754,7 +754,7 @@ mod tests {
         // before allocation attempts start failing.
         struct BoundedAlloc { fuel: usize }
         unsafe impl Alloc for BoundedAlloc {
-            unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr> {
+            unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
                 let size = layout.size();
                 if size > self.fuel {
                     return Err(AllocErr);
@@ -764,7 +764,7 @@ mod tests {
                     err @ Err(_) => err,
                 }
             }
-            unsafe fn dealloc(&mut self, ptr: NonNull<Void>, layout: Layout) {
+            unsafe fn dealloc(&mut self, ptr: NonNull<Opaque>, layout: Layout) {
                 Global.dealloc(ptr, layout)
             }
         }

src/liballoc/rc.rs

@@ -259,7 +259,7 @@ use core::ops::CoerceUnsized;
 use core::ptr::{self, NonNull};
 use core::convert::From;
 
-use alloc::{Global, Alloc, Layout, Void, box_free};
+use alloc::{Global, Alloc, Layout, Opaque, box_free};
 use string::String;
 use vec::Vec;
 
@@ -737,7 +737,7 @@ impl<T: Clone> RcFromSlice<T> for Rc<[T]> {
         // In the event of a panic, elements that have been written
         // into the new RcBox will be dropped, then the memory freed.
         struct Guard<T> {
-            mem: NonNull<Void>,
+            mem: NonNull<Opaque>,
             elems: *mut T,
             layout: Layout,
             n_elems: usize,
@@ -760,7 +760,7 @@ impl<T: Clone> RcFromSlice<T> for Rc<[T]> {
             let v_ptr = v as *const [T];
             let ptr = Self::allocate_for_ptr(v_ptr);
 
-            let mem = ptr as *mut _ as *mut Void;
+            let mem = ptr as *mut _ as *mut Opaque;
             let layout = Layout::for_value(&*ptr);
 
             // Pointer to first element
@@ -844,7 +844,7 @@ unsafe impl<#[may_dangle] T: ?Sized> Drop for Rc<T> {
                 self.dec_weak();
 
                 if self.weak() == 0 {
-                    Global.dealloc(self.ptr.as_void(), Layout::for_value(self.ptr.as_ref()));
+                    Global.dealloc(self.ptr.as_opaque(), Layout::for_value(self.ptr.as_ref()));
                 }
             }
         }
@@ -1268,7 +1268,7 @@ impl<T: ?Sized> Drop for Weak<T> {
             // the weak count starts at 1, and will only go to zero if all
             // the strong pointers have disappeared.
             if self.weak() == 0 {
-                Global.dealloc(self.ptr.as_void(), Layout::for_value(self.ptr.as_ref()));
+                Global.dealloc(self.ptr.as_opaque(), Layout::for_value(self.ptr.as_ref()));
             }
         }
     }

src/liballoc_system/lib.rs

@@ -41,7 +41,7 @@ const MIN_ALIGN: usize = 8;
 #[allow(dead_code)]
 const MIN_ALIGN: usize = 16;
 
-use core::alloc::{Alloc, GlobalAlloc, AllocErr, Layout, Void};
+use core::alloc::{Alloc, GlobalAlloc, AllocErr, Layout, Opaque};
 use core::ptr::NonNull;
 
 #[unstable(feature = "allocator_api", issue = "32838")]
@@ -50,25 +50,25 @@ pub struct System;
 #[unstable(feature = "allocator_api", issue = "32838")]
 unsafe impl Alloc for System {
     #[inline]
-    unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr> {
+    unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
         NonNull::new(GlobalAlloc::alloc(self, layout)).ok_or(AllocErr)
     }
 
     #[inline]
-    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr> {
+    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
         NonNull::new(GlobalAlloc::alloc_zeroed(self, layout)).ok_or(AllocErr)
     }
 
     #[inline]
-    unsafe fn dealloc(&mut self, ptr: NonNull<Void>, layout: Layout) {
+    unsafe fn dealloc(&mut self, ptr: NonNull<Opaque>, layout: Layout) {
         GlobalAlloc::dealloc(self, ptr.as_ptr(), layout)
     }
 
     #[inline]
     unsafe fn realloc(&mut self,
-                      ptr: NonNull<Void>,
+                      ptr: NonNull<Opaque>,
                       layout: Layout,
-                      new_size: usize) -> Result<NonNull<Void>, AllocErr> {
+                      new_size: usize) -> Result<NonNull<Opaque>, AllocErr> {
         NonNull::new(GlobalAlloc::realloc(self, ptr.as_ptr(), layout, new_size)).ok_or(AllocErr)
     }
 
@@ -82,25 +82,25 @@ unsafe impl Alloc for System {
 #[unstable(feature = "allocator_api", issue = "32838")]
 unsafe impl<'a> Alloc for &'a System {
     #[inline]
-    unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr> {
+    unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
         NonNull::new(GlobalAlloc::alloc(*self, layout)).ok_or(AllocErr)
     }
 
     #[inline]
-    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr> {
+    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
         NonNull::new(GlobalAlloc::alloc_zeroed(*self, layout)).ok_or(AllocErr)
     }
 
     #[inline]
-    unsafe fn dealloc(&mut self, ptr: NonNull<Void>, layout: Layout) {
+    unsafe fn dealloc(&mut self, ptr: NonNull<Opaque>, layout: Layout) {
         GlobalAlloc::dealloc(*self, ptr.as_ptr(), layout)
     }
 
     #[inline]
     unsafe fn realloc(&mut self,
-                      ptr: NonNull<Void>,
+                      ptr: NonNull<Opaque>,
                       layout: Layout,
-                      new_size: usize) -> Result<NonNull<Void>, AllocErr> {
+                      new_size: usize) -> Result<NonNull<Opaque>, AllocErr> {
         NonNull::new(GlobalAlloc::realloc(*self, ptr.as_ptr(), layout, new_size)).ok_or(AllocErr)
     }
 
@@ -112,13 +112,13 @@ unsafe impl<'a> Alloc for &'a System {
 
 #[cfg(any(windows, unix, target_os = "cloudabi", target_os = "redox"))]
 mod realloc_fallback {
-    use core::alloc::{GlobalAlloc, Void, Layout};
+    use core::alloc::{GlobalAlloc, Opaque, Layout};
     use core::cmp;
     use core::ptr;
 
     impl super::System {
-        pub(crate) unsafe fn realloc_fallback(&self, ptr: *mut Void, old_layout: Layout,
+        pub(crate) unsafe fn realloc_fallback(&self, ptr: *mut Opaque, old_layout: Layout,
-                                              new_size: usize) -> *mut Void {
+                                              new_size: usize) -> *mut Opaque {
             // Docs for GlobalAlloc::realloc require this to be valid:
             let new_layout = Layout::from_size_align_unchecked(new_size, old_layout.align());
 
@@ -141,20 +141,21 @@ mod platform {
 
     use MIN_ALIGN;
     use System;
-    use core::alloc::{GlobalAlloc, Layout, Void};
+    use core::alloc::{GlobalAlloc, Layout, Opaque};
 
     #[unstable(feature = "allocator_api", issue = "32838")]
     unsafe impl GlobalAlloc for System {
         #[inline]
-        unsafe fn alloc(&self, layout: Layout) -> *mut Void {
+        unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
             if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
-                libc::malloc(layout.size()) as *mut Void
+                libc::malloc(layout.size()) as *mut Opaque
             } else {
                 #[cfg(target_os = "macos")]
                 {
                     if layout.align() > (1 << 31) {
-                        // FIXME: use Void::null_mut https://github.com/rust-lang/rust/issues/49659
+                        // FIXME: use Opaque::null_mut
-                        return 0 as *mut Void
+                        // https://github.com/rust-lang/rust/issues/49659
+                        return 0 as *mut Opaque
                     }
                 }
                 aligned_malloc(&layout)
@@ -162,9 +163,9 @@ mod platform {
         }
 
         #[inline]
-        unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Void {
+        unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Opaque {
             if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
-                libc::calloc(layout.size(), 1) as *mut Void
+                libc::calloc(layout.size(), 1) as *mut Opaque
             } else {
                 let ptr = self.alloc(layout.clone());
                 if !ptr.is_null() {
@@ -175,24 +176,23 @@ mod platform {
         }
 
         #[inline]
-        unsafe fn dealloc(&self, ptr: *mut Void, _layout: Layout) {
+        unsafe fn dealloc(&self, ptr: *mut Opaque, _layout: Layout) {
             libc::free(ptr as *mut libc::c_void)
         }
 
         #[inline]
-        unsafe fn realloc(&self, ptr: *mut Void, old_layout: Layout, new_size: usize) -> *mut Void {
+        unsafe fn realloc(&self, ptr: *mut Opaque, layout: Layout, new_size: usize) -> *mut Opaque {
-            let align = old_layout.align();
+            if layout.align() <= MIN_ALIGN && layout.align() <= new_size {
-            if align <= MIN_ALIGN && align <= new_size {
+                libc::realloc(ptr as *mut libc::c_void, new_size) as *mut Opaque
-                libc::realloc(ptr as *mut libc::c_void, new_size) as *mut Void
             } else {
-                self.realloc_fallback(ptr, old_layout, new_size)
+                self.realloc_fallback(ptr, layout, new_size)
             }
         }
     }
 
     #[cfg(any(target_os = "android", target_os = "redox", target_os = "solaris"))]
     #[inline]
-    unsafe fn aligned_malloc(layout: &Layout) -> *mut Void {
+    unsafe fn aligned_malloc(layout: &Layout) -> *mut Opaque {
         // On android we currently target API level 9 which unfortunately
         // doesn't have the `posix_memalign` API used below. Instead we use
         // `memalign`, but this unfortunately has the property on some systems
@@ -210,19 +210,19 @@ mod platform {
         // [3]: https://bugs.chromium.org/p/chromium/issues/detail?id=138579
         // [4]: https://chromium.googlesource.com/chromium/src/base/+/master/
         //                                       /memory/aligned_memory.cc
-        libc::memalign(layout.align(), layout.size()) as *mut Void
+        libc::memalign(layout.align(), layout.size()) as *mut Opaque
     }
 
     #[cfg(not(any(target_os = "android", target_os = "redox", target_os = "solaris")))]
     #[inline]
-    unsafe fn aligned_malloc(layout: &Layout) -> *mut Void {
+    unsafe fn aligned_malloc(layout: &Layout) -> *mut Opaque {
         let mut out = ptr::null_mut();
         let ret = libc::posix_memalign(&mut out, layout.align(), layout.size());
         if ret != 0 {
-            // FIXME: use Void::null_mut https://github.com/rust-lang/rust/issues/49659
+            // FIXME: use Opaque::null_mut https://github.com/rust-lang/rust/issues/49659
-            0 as *mut Void
+            0 as *mut Opaque
         } else {
-            out as *mut Void
+            out as *mut Opaque
         }
     }
 }
@@ -232,7 +232,7 @@ mod platform {
 mod platform {
     use MIN_ALIGN;
     use System;
-    use core::alloc::{GlobalAlloc, Void, Layout};
+    use core::alloc::{GlobalAlloc, Opaque, Layout};
 
     type LPVOID = *mut u8;
     type HANDLE = LPVOID;
@@ -264,7 +264,7 @@ mod platform {
     }
 
     #[inline]
-    unsafe fn allocate_with_flags(layout: Layout, flags: DWORD) -> *mut Void {
+    unsafe fn allocate_with_flags(layout: Layout, flags: DWORD) -> *mut Opaque {
         let ptr = if layout.align() <= MIN_ALIGN {
             HeapAlloc(GetProcessHeap(), flags, layout.size())
         } else {
@@ -276,23 +276,23 @@ mod platform {
                 align_ptr(ptr, layout.align())
             }
         };
-        ptr as *mut Void
+        ptr as *mut Opaque
     }
 
     #[unstable(feature = "allocator_api", issue = "32838")]
     unsafe impl GlobalAlloc for System {
         #[inline]
-        unsafe fn alloc(&self, layout: Layout) -> *mut Void {
+        unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
             allocate_with_flags(layout, 0)
         }
 
         #[inline]
-        unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Void {
+        unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Opaque {
             allocate_with_flags(layout, HEAP_ZERO_MEMORY)
         }
 
         #[inline]
-        unsafe fn dealloc(&self, ptr: *mut Void, layout: Layout) {
+        unsafe fn dealloc(&self, ptr: *mut Opaque, layout: Layout) {
             if layout.align() <= MIN_ALIGN {
                 let err = HeapFree(GetProcessHeap(), 0, ptr as LPVOID);
                 debug_assert!(err != 0, "Failed to free heap memory: {}",
@@ -306,12 +306,11 @@ mod platform {
         }
 
         #[inline]
-        unsafe fn realloc(&self, ptr: *mut Void, old_layout: Layout, new_size: usize) -> *mut Void {
+        unsafe fn realloc(&self, ptr: *mut Opaque, layout: Layout, new_size: usize) -> *mut Opaque {
-            let align = old_layout.align();
+            if layout.align() <= MIN_ALIGN {
-            if align <= MIN_ALIGN {
+                HeapReAlloc(GetProcessHeap(), 0, ptr as LPVOID, new_size) as *mut Opaque
-                HeapReAlloc(GetProcessHeap(), 0, ptr as LPVOID, new_size) as *mut Void
             } else {
-                self.realloc_fallback(ptr, old_layout, new_size)
+                self.realloc_fallback(ptr, layout, new_size)
             }
         }
     }
@@ -338,7 +337,7 @@ mod platform {
 mod platform {
     extern crate dlmalloc;
 
-    use core::alloc::{GlobalAlloc, Layout, Void};
+    use core::alloc::{GlobalAlloc, Layout, Opaque};
     use System;
 
     // No need for synchronization here as wasm is currently single-threaded
@@ -347,23 +346,23 @@ mod platform {
     #[unstable(feature = "allocator_api", issue = "32838")]
     unsafe impl GlobalAlloc for System {
         #[inline]
-        unsafe fn alloc(&self, layout: Layout) -> *mut Void {
+        unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
-            DLMALLOC.malloc(layout.size(), layout.align()) as *mut Void
+            DLMALLOC.malloc(layout.size(), layout.align()) as *mut Opaque
         }
 
         #[inline]
-        unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Void {
+        unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Opaque {
-            DLMALLOC.calloc(layout.size(), layout.align()) as *mut Void
+            DLMALLOC.calloc(layout.size(), layout.align()) as *mut Opaque
         }
 
         #[inline]
-        unsafe fn dealloc(&self, ptr: *mut Void, layout: Layout) {
+        unsafe fn dealloc(&self, ptr: *mut Opaque, layout: Layout) {
             DLMALLOC.free(ptr as *mut u8, layout.size(), layout.align())
         }
 
         #[inline]
-        unsafe fn realloc(&self, ptr: *mut Void, layout: Layout, new_size: usize) -> *mut Void {
+        unsafe fn realloc(&self, ptr: *mut Opaque, layout: Layout, new_size: usize) -> *mut Opaque {
-            DLMALLOC.realloc(ptr as *mut u8, layout.size(), layout.align(), new_size) as *mut Void
+            DLMALLOC.realloc(ptr as *mut u8, layout.size(), layout.align(), new_size) as *mut Opaque
         }
     }
 }

src/libcore/alloc.rs

@@ -24,12 +24,12 @@ use ptr::{self, NonNull};
 extern {
     /// An opaque, unsized type. Used for pointers to allocated memory.
     ///
-    /// This type can only be used behind a pointer like `*mut Void` or `ptr::NonNull<Void>`.
+    /// This type can only be used behind a pointer like `*mut Opaque` or `ptr::NonNull<Opaque>`.
     /// Such pointers are similar to C’s `void*` type.
-    pub type Void;
+    pub type Opaque;
 }
 
-impl Void {
+impl Opaque {
     /// Similar to `std::ptr::null`, which requires `T: Sized`.
     pub fn null() -> *const Self {
         0 as _
@@ -44,7 +44,7 @@ impl Void {
 /// Represents the combination of a starting address and
 /// a total capacity of the returned block.
 #[derive(Debug)]
-pub struct Excess(pub NonNull<Void>, pub usize);
+pub struct Excess(pub NonNull<Opaque>, pub usize);
 
 fn size_align<T>() -> (usize, usize) {
     (mem::size_of::<T>(), mem::align_of::<T>())
@@ -387,11 +387,11 @@ impl From<AllocErr> for CollectionAllocErr {
 
 // FIXME: docs
 pub unsafe trait GlobalAlloc {
-    unsafe fn alloc(&self, layout: Layout) -> *mut Void;
+    unsafe fn alloc(&self, layout: Layout) -> *mut Opaque;
 
-    unsafe fn dealloc(&self, ptr: *mut Void, layout: Layout);
+    unsafe fn dealloc(&self, ptr: *mut Opaque, layout: Layout);
 
-    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Void {
+    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Opaque {
         let size = layout.size();
         let ptr = self.alloc(layout);
         if !ptr.is_null() {
@@ -404,7 +404,7 @@ pub unsafe trait GlobalAlloc {
     ///
     /// `new_size`, when rounded up to the nearest multiple of `old_layout.align()`,
     /// must not overflow (i.e. the rounded value must be less than `usize::MAX`).
-    unsafe fn realloc(&self, ptr: *mut Void, old_layout: Layout, new_size: usize) -> *mut Void {
+    unsafe fn realloc(&self, ptr: *mut Opaque, old_layout: Layout, new_size: usize) -> *mut Opaque {
         let new_layout = Layout::from_size_align_unchecked(new_size, old_layout.align());
         let new_ptr = self.alloc(new_layout);
         if !new_ptr.is_null() {
@@ -554,7 +554,7 @@ pub unsafe trait Alloc {
     /// Clients wishing to abort computation in response to an
     /// allocation error are encouraged to call the allocator's `oom`
     /// method, rather than directly invoking `panic!` or similar.
-    unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr>;
+    unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr>;
 
     /// Deallocate the memory referenced by `ptr`.
     ///
@@ -571,7 +571,7 @@ pub unsafe trait Alloc {
     /// * In addition to fitting the block of memory `layout`, the
     ///   alignment of the `layout` must match the alignment used
     ///   to allocate that block of memory.
-    unsafe fn dealloc(&mut self, ptr: NonNull<Void>, layout: Layout);
+    unsafe fn dealloc(&mut self, ptr: NonNull<Opaque>, layout: Layout);
 
     /// Allocator-specific method for signaling an out-of-memory
     /// condition.
@@ -689,9 +689,9 @@ pub unsafe trait Alloc {
     /// reallocation error are encouraged to call the allocator's `oom`
     /// method, rather than directly invoking `panic!` or similar.
     unsafe fn realloc(&mut self,
-                      ptr: NonNull<Void>,
+                      ptr: NonNull<Opaque>,
                       layout: Layout,
-                      new_size: usize) -> Result<NonNull<Void>, AllocErr> {
+                      new_size: usize) -> Result<NonNull<Opaque>, AllocErr> {
         let old_size = layout.size();
 
         if new_size >= old_size {
@@ -732,7 +732,7 @@ pub unsafe trait Alloc {
     /// Clients wishing to abort computation in response to an
     /// allocation error are encouraged to call the allocator's `oom`
     /// method, rather than directly invoking `panic!` or similar.
-    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Void>, AllocErr> {
+    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
         let size = layout.size();
         let p = self.alloc(layout);
         if let Ok(p) = p {
@@ -781,7 +781,7 @@ pub unsafe trait Alloc {
     /// reallocation error are encouraged to call the allocator's `oom`
     /// method, rather than directly invoking `panic!` or similar.
     unsafe fn realloc_excess(&mut self,
-                             ptr: NonNull<Void>,
+                             ptr: NonNull<Opaque>,
                              layout: Layout,
                              new_size: usize) -> Result<Excess, AllocErr> {
         let new_layout = Layout::from_size_align_unchecked(new_size, layout.align());
@@ -826,7 +826,7 @@ pub unsafe trait Alloc {
     /// `grow_in_place` failures without aborting, or to fall back on
     /// another reallocation method before resorting to an abort.
     unsafe fn grow_in_place(&mut self,
-                            ptr: NonNull<Void>,
+                            ptr: NonNull<Opaque>,
                             layout: Layout,
                             new_size: usize) -> Result<(), CannotReallocInPlace> {
         let _ = ptr; // this default implementation doesn't care about the actual address.
@@ -881,7 +881,7 @@ pub unsafe trait Alloc {
     /// `shrink_in_place` failures without aborting, or to fall back
     /// on another reallocation method before resorting to an abort.
     unsafe fn shrink_in_place(&mut self,
-                              ptr: NonNull<Void>,
+                              ptr: NonNull<Opaque>,
                               layout: Layout,
                               new_size: usize) -> Result<(), CannotReallocInPlace> {
         let _ = ptr; // this default implementation doesn't care about the actual address.
@@ -960,7 +960,7 @@ pub unsafe trait Alloc {
     {
         let k = Layout::new::<T>();
         if k.size() > 0 {
-            self.dealloc(ptr.as_void(), k);
+            self.dealloc(ptr.as_opaque(), k);
         }
     }
 
@@ -1048,7 +1048,7 @@ pub unsafe trait Alloc {
         match (Layout::array::<T>(n_old), Layout::array::<T>(n_new)) {
             (Ok(ref k_old), Ok(ref k_new)) if k_old.size() > 0 && k_new.size() > 0 => {
                 debug_assert!(k_old.align() == k_new.align());
-                self.realloc(ptr.as_void(), k_old.clone(), k_new.size()).map(NonNull::cast)
+                self.realloc(ptr.as_opaque(), k_old.clone(), k_new.size()).map(NonNull::cast)
             }
             _ => {
                 Err(AllocErr)
@@ -1081,7 +1081,7 @@ pub unsafe trait Alloc {
     {
         match Layout::array::<T>(n) {
             Ok(ref k) if k.size() > 0 => {
-                Ok(self.dealloc(ptr.as_void(), k.clone()))
+                Ok(self.dealloc(ptr.as_opaque(), k.clone()))
             }
             _ => {
                 Err(AllocErr)

src/libcore/ptr.rs

@@ -2751,9 +2751,9 @@ impl<T: ?Sized> NonNull<T> {
         }
     }
 
-    /// Cast to a `Void` pointer
+    /// Cast to an `Opaque` pointer
     #[unstable(feature = "allocator_api", issue = "32838")]
-    pub fn as_void(self) -> NonNull<::alloc::Void> {
+    pub fn as_opaque(self) -> NonNull<::alloc::Opaque> {
         unsafe {
             NonNull::new_unchecked(self.as_ptr() as _)
         }

src/librustc_allocator/expand.rs

@@ -221,7 +221,7 @@ impl<'a> AllocFnFactory<'a> {
                 let ident = ident();
                 args.push(self.cx.arg(self.span, ident, self.ptr_u8()));
                 let arg = self.cx.expr_ident(self.span, ident);
-                self.cx.expr_cast(self.span, arg, self.ptr_void())
+                self.cx.expr_cast(self.span, arg, self.ptr_opaque())
             }
 
             AllocatorTy::Usize => {
@@ -276,13 +276,13 @@ impl<'a> AllocFnFactory<'a> {
         self.cx.ty_ptr(self.span, ty_u8, Mutability::Mutable)
     }
 
-    fn ptr_void(&self) -> P<Ty> {
+    fn ptr_opaque(&self) -> P<Ty> {
-        let void = self.cx.path(self.span, vec![
+        let opaque = self.cx.path(self.span, vec![
             self.core,
             Ident::from_str("alloc"),
-            Ident::from_str("Void"),
+            Ident::from_str("Opaque"),
         ]);
-        let ty_void = self.cx.ty_path(void);
+        let ty_opaque = self.cx.ty_path(opaque);
-        self.cx.ty_ptr(self.span, ty_void, Mutability::Mutable)
+        self.cx.ty_ptr(self.span, ty_opaque, Mutability::Mutable)
     }
 }

src/libstd/alloc.rs

@@ -21,7 +21,7 @@
 #[doc(hidden)]
 #[allow(unused_attributes)]
 pub mod __default_lib_allocator {
-    use super::{System, Layout, GlobalAlloc, Void};
+    use super::{System, Layout, GlobalAlloc, Opaque};
     // for symbol names src/librustc/middle/allocator.rs
     // for signatures src/librustc_allocator/lib.rs
 
@@ -46,7 +46,7 @@ pub mod __default_lib_allocator {
     pub unsafe extern fn __rdl_dealloc(ptr: *mut u8,
                                        size: usize,
                                        align: usize) {
-        System.dealloc(ptr as *mut Void, Layout::from_size_align_unchecked(size, align))
+        System.dealloc(ptr as *mut Opaque, Layout::from_size_align_unchecked(size, align))
     }
 
     #[no_mangle]
@@ -56,7 +56,7 @@ pub mod __default_lib_allocator {
                                        align: usize,
                                        new_size: usize) -> *mut u8 {
         let old_layout = Layout::from_size_align_unchecked(old_size, align);
-        System.realloc(ptr as *mut Void, old_layout, new_size) as *mut u8
+        System.realloc(ptr as *mut Opaque, old_layout, new_size) as *mut u8
     }
 
     #[no_mangle]

src/libstd/collections/hash/table.rs

@@ -1183,7 +1183,7 @@ unsafe impl<#[may_dangle] K, #[may_dangle] V> Drop for RawTable<K, V> {
         debug_assert!(!oflo, "should be impossible");
 
         unsafe {
-            Global.dealloc(NonNull::new_unchecked(self.hashes.ptr()).as_void(),
+            Global.dealloc(NonNull::new_unchecked(self.hashes.ptr()).as_opaque(),
                            Layout::from_size_align(size, align).unwrap());
             // Remember how everything was allocated out of one buffer
             // during initialization? We only need one call to free here.

src/test/run-make-fulldeps/std-core-cycle/bar.rs

@@ -16,11 +16,11 @@ use std::alloc::*;
 pub struct A;
 
 unsafe impl GlobalAlloc for A {
-    unsafe fn alloc(&self, _: Layout) -> *mut Void {
+    unsafe fn alloc(&self, _: Layout) -> *mut Opaque {
         loop {}
     }
 
-    unsafe fn dealloc(&self, _ptr: *mut Void, _: Layout) {
+    unsafe fn dealloc(&self, _ptr: *mut Opaque, _: Layout) {
         loop {}
     }
 }

src/test/run-pass/allocator/auxiliary/custom.rs

@@ -13,18 +13,18 @@
 #![feature(heap_api, allocator_api)]
 #![crate_type = "rlib"]
 
-use std::heap::{GlobalAlloc, System, Layout, Void};
+use std::heap::{GlobalAlloc, System, Layout, Opaque};
 use std::sync::atomic::{AtomicUsize, Ordering};
 
 pub struct A(pub AtomicUsize);
 
 unsafe impl GlobalAlloc for A {
-    unsafe fn alloc(&self, layout: Layout) -> *mut Void {
+    unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
         self.0.fetch_add(1, Ordering::SeqCst);
         System.alloc(layout)
     }
 
-    unsafe fn dealloc(&self, ptr: *mut Void, layout: Layout) {
+    unsafe fn dealloc(&self, ptr: *mut Opaque, layout: Layout) {
         self.0.fetch_add(1, Ordering::SeqCst);
         System.dealloc(ptr, layout)
     }

src/test/run-pass/allocator/custom.rs

@@ -15,7 +15,7 @@
 
 extern crate helper;
 
-use std::alloc::{self, Global, Alloc, System, Layout, Void};
+use std::alloc::{self, Global, Alloc, System, Layout, Opaque};
 use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
 
 static HITS: AtomicUsize = ATOMIC_USIZE_INIT;
@@ -23,12 +23,12 @@ static HITS: AtomicUsize = ATOMIC_USIZE_INIT;
 struct A;
 
 unsafe impl alloc::GlobalAlloc for A {
-    unsafe fn alloc(&self, layout: Layout) -> *mut Void {
+    unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
         HITS.fetch_add(1, Ordering::SeqCst);
         System.alloc(layout)
     }
 
-    unsafe fn dealloc(&self, ptr: *mut Void, layout: Layout) {
+    unsafe fn dealloc(&self, ptr: *mut Opaque, layout: Layout) {
         HITS.fetch_add(1, Ordering::SeqCst);
         System.dealloc(ptr, layout)
     }

src/test/run-pass/realloc-16687.rs

@@ -64,7 +64,7 @@ unsafe fn test_triangle() -> bool {
             println!("deallocate({:?}, {:?}", ptr, layout);
         }
 
-        Global.dealloc(NonNull::new_unchecked(ptr).as_void(), layout);
+        Global.dealloc(NonNull::new_unchecked(ptr).as_opaque(), layout);
     }
 
     unsafe fn reallocate(ptr: *mut u8, old: Layout, new: Layout) -> *mut u8 {
@@ -72,7 +72,7 @@ unsafe fn test_triangle() -> bool {
             println!("reallocate({:?}, old={:?}, new={:?})", ptr, old, new);
         }
 
-        let ret = Global.realloc(NonNull::new_unchecked(ptr).as_void(), old.clone(), new.size())
+        let ret = Global.realloc(NonNull::new_unchecked(ptr).as_opaque(), old.clone(), new.size())
             .unwrap_or_else(|_| Global.oom());
 
         if PRINT {