Mark as permanently-unstable some implementation details

Author: SimonSapin

src/libcore/alloc.rs

@@ -18,7 +18,7 @@ use mem;
 use usize;
 use ptr::{self, NonNull};
 
-#[unstable(feature = "allocator_api", issue = "32838")]
+#[unstable(feature = "alloc_internals", issue = "0")]
 #[cfg(stage0)]
 pub type Opaque = u8;
 

src/libstd/alloc.rs

@@ -63,7 +63,7 @@ fn default_oom_hook(layout: Layout) -> ! {
 #[cfg(not(test))]
 #[doc(hidden)]
 #[lang = "oom"]
-#[unstable(feature = "allocator_api", issue = "32838")]
+#[unstable(feature = "alloc_internals", issue = "0")]
 pub extern fn rust_oom(layout: Layout) -> ! {
     let hook = HOOK.load(Ordering::SeqCst);
     let hook: fn(Layout) -> ! = if hook.is_null() {
@@ -77,7 +77,7 @@ pub extern fn rust_oom(layout: Layout) -> ! {
 #[cfg(not(test))]
 #[doc(hidden)]
 #[allow(unused_attributes)]
-#[unstable(feature = "allocator_api", issue = "32838")]
+#[unstable(feature = "alloc_internals", issue = "0")]
 pub mod __default_lib_allocator {
     use super::{System, Layout, GlobalAlloc};
     // for symbol names src/librustc/middle/allocator.rs