std: Stabilize APIs for the 1.7 release

This commit stabilizes and deprecates the FCP (final comment period) APIs for
the upcoming 1.7 beta release. The specific APIs which changed were:

Stabilized

* `Path::strip_prefix` (renamed from `relative_from`)
* `path::StripPrefixError` (new error type returned from `strip_prefix`)
* `Ipv4Addr::is_loopback`
* `Ipv4Addr::is_private`
* `Ipv4Addr::is_link_local`
* `Ipv4Addr::is_multicast`
* `Ipv4Addr::is_broadcast`
* `Ipv4Addr::is_documentation`
* `Ipv6Addr::is_unspecified`
* `Ipv6Addr::is_loopback`
* `Ipv6Addr::is_unique_local`
* `Ipv6Addr::is_multicast`
* `Vec::as_slice`
* `Vec::as_mut_slice`
* `String::as_str`
* `String::as_mut_str`
* `<[T]>::clone_from_slice` - the `usize` return value is removed
* `<[T]>::sort_by_key`
* `i32::checked_rem` (and other signed types)
* `i32::checked_neg` (and other signed types)
* `i32::checked_shl` (and other signed types)
* `i32::checked_shr` (and other signed types)
* `i32::saturating_mul` (and other signed types)
* `i32::overflowing_add` (and other signed types)
* `i32::overflowing_sub` (and other signed types)
* `i32::overflowing_mul` (and other signed types)
* `i32::overflowing_div` (and other signed types)
* `i32::overflowing_rem` (and other signed types)
* `i32::overflowing_neg` (and other signed types)
* `i32::overflowing_shl` (and other signed types)
* `i32::overflowing_shr` (and other signed types)
* `u32::checked_rem` (and other unsigned types)
* `u32::checked_neg` (and other unsigned types)
* `u32::checked_shl` (and other unsigned types)
* `u32::saturating_mul` (and other unsigned types)
* `u32::overflowing_add` (and other unsigned types)
* `u32::overflowing_sub` (and other unsigned types)
* `u32::overflowing_mul` (and other unsigned types)
* `u32::overflowing_div` (and other unsigned types)
* `u32::overflowing_rem` (and other unsigned types)
* `u32::overflowing_neg` (and other unsigned types)
* `u32::overflowing_shl` (and other unsigned types)
* `u32::overflowing_shr` (and other unsigned types)
* `ffi::IntoStringError`
* `CString::into_string`
* `CString::into_bytes`
* `CString::into_bytes_with_nul`
* `From<CString> for Vec<u8>`
* `From<CString> for Vec<u8>`
* `IntoStringError::into_cstring`
* `IntoStringError::utf8_error`
* `Error for IntoStringError`

Deprecated

* `Path::relative_from` - renamed to `strip_prefix`
* `Path::prefix` - use `components().next()` instead
* `os::unix::fs` constants - moved to the `libc` crate
* `fmt::{radix, Radix, RadixFmt}` - not used enough to stabilize
* `IntoCow` - conflicts with `Into` and may come back later
* `i32::{BITS, BYTES}` (and other integers) - not pulling their weight
* `DebugTuple::formatter` - will be removed
* `sync::Semaphore` - not used enough and confused with system semaphores

Closes #23284
cc #27709 (still lots more methods though)
Closes #27712
Closes #27722
Closes #27728
Closes #27735
Closes #27729
Closes #27755
Closes #27782
Closes #27798

1 files changed, 7 insertions, 7 deletions

diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index d85212d25e7..dd111981f0e 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -32,7 +32,6 @@ use option::Option::{self, None, Some};
 use raw::{Repr, Slice};
 use result::Result::{self, Ok, Err};
 use slice::{self, SliceExt};
-use usize;
 
 pub mod pattern;
 
@@ -1160,15 +1159,16 @@ fn run_utf8_validation(v: &[u8]) -> Result<(), Utf8Error> {
             // Ascii case, try to skip forward quickly.
             // When the pointer is aligned, read 2 words of data per iteration
             // until we find a word containing a non-ascii byte.
-            const BYTES_PER_ITERATION: usize = 2 * usize::BYTES;
+            let usize_bytes = mem::size_of::<usize>();
+            let bytes_per_iteration = 2 * usize_bytes;
             let ptr = v.as_ptr();
-            let align = (ptr as usize + offset) & (usize::BYTES - 1);
+            let align = (ptr as usize + offset) & (usize_bytes - 1);
             if align == 0 {
-                if len >= BYTES_PER_ITERATION {
-                    while offset <= len - BYTES_PER_ITERATION {
+                if len >= bytes_per_iteration {
+                    while offset <= len - bytes_per_iteration {
                         unsafe {
                             let u = *(ptr.offset(offset as isize) as *const usize);
-                            let v = *(ptr.offset((offset + usize::BYTES) as isize) as *const usize);
+                            let v = *(ptr.offset((offset + usize_bytes) as isize) as *const usize);
 
                             // break if there is a nonascii byte
                             let zu = contains_nonascii(u);
@@ -1177,7 +1177,7 @@ fn run_utf8_validation(v: &[u8]) -> Result<(), Utf8Error> {
                                 break;
                             }
                         }
-                        offset += BYTES_PER_ITERATION;
+                        offset += bytes_per_iteration;
                     }
                 }
                 // step from the point where the wordwise loop stopped