Mark deprecated unstable SipHasher13 as a doc-hidden impl detail of HashMap.

It stays in libcore rather than being private in HashMap’s module
because it shares code with the deprecated *stable* `SipHasher` type.

Author: SimonSapin

src/libcore/hash/mod.rs

@@ -99,8 +99,9 @@ use mem;
 #[allow(deprecated)]
 pub use self::sip::SipHasher;
 
-#[unstable(feature = "sip_hash_13", issue = "34767")]
+#[unstable(feature = "hashmap_internals", issue = "0")]
 #[allow(deprecated)]
+#[doc(hidden)]
 pub use self::sip::SipHasher13;
 
 mod sip;

src/libcore/hash/sip.rs

@@ -23,18 +23,19 @@ use mem;
 /// (eg. `collections::HashMap` uses it by default).
 ///
 /// See: <https://131002.net/siphash>
-#[unstable(feature = "sip_hash_13", issue = "34767")]
+#[unstable(feature = "hashmap_internals", issue = "0")]
 #[rustc_deprecated(since = "1.13.0",
                    reason = "use `std::collections::hash_map::DefaultHasher` instead")]
 #[derive(Debug, Clone, Default)]
+#[doc(hidden)]
 pub struct SipHasher13 {
     hasher: Hasher<Sip13Rounds>,
 }
 
 /// An implementation of SipHash 2-4.
 ///
 /// See: <https://131002.net/siphash/>
-#[unstable(feature = "sip_hash_13", issue = "34767")]
+#[unstable(feature = "hashmap_internals", issue = "0")]
 #[rustc_deprecated(since = "1.13.0",
                    reason = "use `std::collections::hash_map::DefaultHasher` instead")]
 #[derive(Debug, Clone, Default)]
@@ -165,7 +166,7 @@ impl SipHasher {
 impl SipHasher13 {
     /// Creates a new `SipHasher13` with the two initial keys set to 0.
     #[inline]
-    #[unstable(feature = "sip_hash_13", issue = "34767")]
+    #[unstable(feature = "hashmap_internals", issue = "0")]
     #[rustc_deprecated(since = "1.13.0",
                        reason = "use `std::collections::hash_map::DefaultHasher` instead")]
     pub fn new() -> SipHasher13 {
@@ -174,7 +175,7 @@ impl SipHasher13 {
 
     /// Creates a `SipHasher13` that is keyed off the provided keys.
     #[inline]
-    #[unstable(feature = "sip_hash_13", issue = "34767")]
+    #[unstable(feature = "hashmap_internals", issue = "0")]
     #[rustc_deprecated(since = "1.13.0",
                        reason = "use `std::collections::hash_map::DefaultHasher` instead")]
     pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher13 {
@@ -260,7 +261,7 @@ impl super::Hasher for SipHasher {
     }
 }
 
-#[unstable(feature = "sip_hash_13", issue = "34767")]
+#[unstable(feature = "hashmap_internals", issue = "0")]
 impl super::Hasher for SipHasher13 {
     #[inline]
     fn write(&mut self, msg: &[u8]) {

src/libcore/tests/lib.rs

@@ -21,6 +21,7 @@
 #![feature(fixed_size_array)]
 #![feature(flt2dec)]
 #![feature(fmt_internals)]
+#![feature(hashmap_internals)]
 #![feature(iterator_step_by)]
 #![feature(i128_type)]
 #![cfg_attr(stage0, feature(inclusive_range_syntax))]
@@ -35,7 +36,6 @@
 #![feature(range_is_empty)]
 #![feature(raw)]
 #![feature(refcell_replace_swap)]
-#![feature(sip_hash_13)]
 #![feature(slice_patterns)]
 #![feature(sort_internals)]
 #![feature(specialization)]

src/libstd/lib.rs

@@ -267,7 +267,7 @@
 #![feature(fn_traits)]
 #![feature(fnbox)]
 #![feature(generic_param_attrs)]
-#![feature(hashmap_hasher)]
+#![feature(hashmap_internals)]
 #![feature(heap_api)]
 #![feature(i128)]
 #![feature(i128_type)]
@@ -298,7 +298,6 @@
 #![feature(raw)]
 #![feature(rustc_attrs)]
 #![feature(stdsimd)]
-#![feature(sip_hash_13)]
 #![feature(slice_bytes)]
 #![feature(slice_concat_ext)]
 #![feature(slice_internals)]