auto merge of #15591 : aturon/rust/box-cell-stability, r=alexcrichton

This PR is the outcome of the library stabilization meeting for the
`liballoc::owned` and `libcore::cell` modules.

Aside from the stability attributes, there are a few breaking changes:

* The `owned` modules is now named `boxed`, to better represent its
  contents. (`box` was unavailable, since it's a keyword.) This will
  help avoid the misconception that `Box` plays a special role wrt
  ownership.

* The `AnyOwnExt` extension trait is renamed to `BoxAny`, and its `move`
  method is renamed to `downcast`, in both cases to improve clarity.

* The recently-added `AnySendOwnExt` extension trait is removed; it was
  not being used and is unnecessary.

[breaking-change]

11 files changed, 11 insertions, 11 deletions

diff --git a/src/libsync/atomics.rs b/src/libsync/atomics.rs
index 195efb844a7..0be124ad584 100644
--- a/src/libsync/atomics.rs
+++ b/src/libsync/atomics.rs
@@ -103,7 +103,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::mem;
 
 pub use core::atomics::{AtomicBool, AtomicInt, AtomicUint, AtomicPtr};
diff --git a/src/libsync/comm/mod.rs b/src/libsync/comm/mod.rs
index 6c09a021c43..e9a303634fe 100644
--- a/src/libsync/comm/mod.rs
+++ b/src/libsync/comm/mod.rs
@@ -320,7 +320,7 @@
 use core::prelude::*;
 
 use alloc::arc::Arc;
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::cell::Cell;
 use core::kinds::marker;
 use core::mem;
diff --git a/src/libsync/comm/oneshot.rs b/src/libsync/comm/oneshot.rs
index 742686069e2..c9782db5c24 100644
--- a/src/libsync/comm/oneshot.rs
+++ b/src/libsync/comm/oneshot.rs
@@ -34,7 +34,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::mem;
 use rustrt::local::Local;
 use rustrt::task::{Task, BlockedTask};
diff --git a/src/libsync/comm/select.rs b/src/libsync/comm/select.rs
index 230bca624f5..737a4bfe299 100644
--- a/src/libsync/comm/select.rs
+++ b/src/libsync/comm/select.rs
@@ -54,7 +54,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::cell::Cell;
 use core::kinds::marker;
 use core::mem;
diff --git a/src/libsync/comm/shared.rs b/src/libsync/comm/shared.rs
index 5ad4dea5d2a..d13b2c32978 100644
--- a/src/libsync/comm/shared.rs
+++ b/src/libsync/comm/shared.rs
@@ -20,7 +20,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::cmp;
 use core::int;
 use rustrt::local::Local;
diff --git a/src/libsync/comm/stream.rs b/src/libsync/comm/stream.rs
index 6f337f17309..9747c207a22 100644
--- a/src/libsync/comm/stream.rs
+++ b/src/libsync/comm/stream.rs
@@ -19,7 +19,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::cmp;
 use core::int;
 use rustrt::local::Local;
diff --git a/src/libsync/comm/sync.rs b/src/libsync/comm/sync.rs
index 4d54df2fc19..cc3c2197c13 100644
--- a/src/libsync/comm/sync.rs
+++ b/src/libsync/comm/sync.rs
@@ -35,7 +35,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use collections::Vec;
 use collections::Collection;
 use core::mem;
diff --git a/src/libsync/deque.rs b/src/libsync/deque.rs
index 8d2192aeb53..913a58010d4 100644
--- a/src/libsync/deque.rs
+++ b/src/libsync/deque.rs
@@ -54,7 +54,7 @@ use core::prelude::*;
 
 use alloc::arc::Arc;
 use alloc::heap::{allocate, deallocate};
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use collections::Vec;
 use core::kinds::marker;
 use core::mem::{forget, min_align_of, size_of, transmute};
diff --git a/src/libsync/mpsc_queue.rs b/src/libsync/mpsc_queue.rs
index ecd37e68880..759695fe5b6 100644
--- a/src/libsync/mpsc_queue.rs
+++ b/src/libsync/mpsc_queue.rs
@@ -42,7 +42,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::mem;
 use core::ty::Unsafe;
 
diff --git a/src/libsync/mutex.rs b/src/libsync/mutex.rs
index a10ec745869..990d743465d 100644
--- a/src/libsync/mutex.rs
+++ b/src/libsync/mutex.rs
@@ -59,7 +59,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::atomics;
 use core::kinds::marker;
 use core::mem;
diff --git a/src/libsync/spsc_queue.rs b/src/libsync/spsc_queue.rs
index 2834d404c18..cf4d3222ed0 100644
--- a/src/libsync/spsc_queue.rs
+++ b/src/libsync/spsc_queue.rs
@@ -37,7 +37,7 @@
 
 use core::prelude::*;
 
-use alloc::owned::Box;
+use alloc::boxed::Box;
 use core::mem;
 use core::ty::Unsafe;