std: Stabilize APIs for the 1.9 release

This commit applies all stabilizations, renamings, and deprecations that the
library team has decided on for the upcoming 1.9 release. All tracking issues
have gone through a cycle-long "final comment period" and the specific APIs
stabilized/deprecated are:

Stable

* `std::panic`
* `std::panic::catch_unwind` (renamed from `recover`)
* `std::panic::resume_unwind` (renamed from `propagate`)
* `std::panic::AssertUnwindSafe` (renamed from `AssertRecoverSafe`)
* `std::panic::UnwindSafe` (renamed from `RecoverSafe`)
* `str::is_char_boundary`
* `<*const T>::as_ref`
* `<*mut T>::as_ref`
* `<*mut T>::as_mut`
* `AsciiExt::make_ascii_uppercase`
* `AsciiExt::make_ascii_lowercase`
* `char::decode_utf16`
* `char::DecodeUtf16`
* `char::DecodeUtf16Error`
* `char::DecodeUtf16Error::unpaired_surrogate`
* `BTreeSet::take`
* `BTreeSet::replace`
* `BTreeSet::get`
* `HashSet::take`
* `HashSet::replace`
* `HashSet::get`
* `OsString::with_capacity`
* `OsString::clear`
* `OsString::capacity`
* `OsString::reserve`
* `OsString::reserve_exact`
* `OsStr::is_empty`
* `OsStr::len`
* `std::os::unix::thread`
* `RawPthread`
* `JoinHandleExt`
* `JoinHandleExt::as_pthread_t`
* `JoinHandleExt::into_pthread_t`
* `HashSet::hasher`
* `HashMap::hasher`
* `CommandExt::exec`
* `File::try_clone`
* `SocketAddr::set_ip`
* `SocketAddr::set_port`
* `SocketAddrV4::set_ip`
* `SocketAddrV4::set_port`
* `SocketAddrV6::set_ip`
* `SocketAddrV6::set_port`
* `SocketAddrV6::set_flowinfo`
* `SocketAddrV6::set_scope_id`
* `<[T]>::copy_from_slice`
* `ptr::read_volatile`
* `ptr::write_volatile`
* The `#[deprecated]` attribute
* `OpenOptions::create_new`

Deprecated

* `std::raw::Slice` - use raw parts of `slice` module instead
* `std::raw::Repr` - use raw parts of `slice` module instead
* `str::char_range_at` - use slicing plus `chars()` plus `len_utf8`
* `str::char_range_at_reverse` - use slicing plus `chars().rev()` plus `len_utf8`
* `str::char_at` - use slicing plus `chars()`
* `str::char_at_reverse` - use slicing plus `chars().rev()`
* `str::slice_shift_char` - use `chars()` plus `Chars::as_str`
* `CommandExt::session_leader` - use `before_exec` instead.

Closes #27719
cc #27751 (deprecating the `Slice` bits)
Closes #27754
Closes #27780
Closes #27809
Closes #27811
Closes #27830
Closes #28050
Closes #29453
Closes #29791
Closes #29935
Closes #30014
Closes #30752
Closes #31262
cc #31398 (still need to deal with `before_exec`)
Closes #31405
Closes #31572
Closes #31755
Closes #31756

1 files changed, 14 insertions, 8 deletions

diff --git a/src/libcore/slice.rs b/src/libcore/slice.rs
index 25082eed2fe..ca1abb4fe0b 100644
--- a/src/libcore/slice.rs
+++ b/src/libcore/slice.rs
@@ -50,10 +50,12 @@ use result::Result::{Ok, Err};
 use ptr;
 use mem;
 use marker::{Copy, Send, Sync, self};
-use raw::Repr;
-// Avoid conflicts with *both* the Slice trait (buggy) and the `slice::raw` module.
-use raw::Slice as RawSlice;
 
+#[repr(C)]
+struct Repr<T> {
+    pub data: *const T,
+    pub len: usize,
+}
 
 //
 // Extension traits
@@ -152,8 +154,8 @@ pub trait SliceExt {
     fn ends_with(&self, needle: &[Self::Item]) -> bool where Self::Item: PartialEq;
 
     #[stable(feature = "clone_from_slice", since = "1.7.0")]
-    fn clone_from_slice(&mut self, &[Self::Item]) where Self::Item: Clone;
-    #[unstable(feature = "copy_from_slice", issue = "31755")]
+    fn clone_from_slice(&mut self, src: &[Self::Item]) where Self::Item: Clone;
+    #[stable(feature = "copy_from_slice", since = "1.9.0")]
     fn copy_from_slice(&mut self, src: &[Self::Item]) where Self::Item: Copy;
 }
 
@@ -317,7 +319,11 @@ impl<T> SliceExt for [T] {
     }
 
     #[inline]
-    fn len(&self) -> usize { self.repr().len }
+    fn len(&self) -> usize {
+        unsafe {
+            mem::transmute::<&[T], Repr<T>>(self).len
+        }
+    }
 
     #[inline]
     fn get_mut(&mut self, index: usize) -> Option<&mut T> {
@@ -1614,7 +1620,7 @@ impl<'a, T> ExactSizeIterator for ChunksMut<'a, T> {}
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub unsafe fn from_raw_parts<'a, T>(p: *const T, len: usize) -> &'a [T] {
-    mem::transmute(RawSlice { data: p, len: len })
+    mem::transmute(Repr { data: p, len: len })
 }
 
 /// Performs the same functionality as `from_raw_parts`, except that a mutable
@@ -1626,7 +1632,7 @@ pub unsafe fn from_raw_parts<'a, T>(p: *const T, len: usize) -> &'a [T] {
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub unsafe fn from_raw_parts_mut<'a, T>(p: *mut T, len: usize) -> &'a mut [T] {
-    mem::transmute(RawSlice { data: p, len: len })
+    mem::transmute(Repr { data: p, len: len })
 }
 
 //