Move impl HashStable for SymbolStr in libsyntax_pos.

src/librustc/ich/impls_syntax.rs

@@ -18,25 +18,6 @@ use crate::hir::def_id::{DefId, CrateNum, CRATE_DEF_INDEX};
 use smallvec::SmallVec;
 use rustc_data_structures::stable_hasher::{HashStable, ToStableHashKey, StableHasher};
 
-impl<'a> HashStable<StableHashingContext<'a>> for SymbolStr {
-    #[inline]
-    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
-        let str = self as &str;
-        str.hash_stable(hcx, hasher)
-    }
-}
-
-impl<'a> ToStableHashKey<StableHashingContext<'a>> for SymbolStr {
-    type KeyType = SymbolStr;
-
-    #[inline]
-    fn to_stable_hash_key(&self,
-                          _: &StableHashingContext<'a>)
-                          -> SymbolStr {
-        self.clone()
-    }
-}
-
 impl<'a> HashStable<StableHashingContext<'a>> for ast::Name {
     #[inline]
     fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {

src/libsyntax_pos/symbol.rs

@@ -8,6 +8,7 @@ use rustc_index::vec::Idx;
 use rustc_macros::symbols;
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
 use rustc_serialize::{UseSpecializedDecodable, UseSpecializedEncodable};
+use rustc_data_structures::stable_hasher::{HashStable, ToStableHashKey, StableHasher};
 
 use std::cmp::{PartialEq, PartialOrd, Ord};
 use std::fmt;
@@ -1136,3 +1137,20 @@ impl fmt::Display for SymbolStr {
         fmt::Display::fmt(self.string, f)
     }
 }
+
+impl<CTX> HashStable<CTX> for SymbolStr {
+    #[inline]
+    fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher) {
+        let str = self as &str;
+        str.hash_stable(hcx, hasher)
+    }
+}
+
+impl<CTX> ToStableHashKey<CTX> for SymbolStr {
+    type KeyType = SymbolStr;
+
+    #[inline]
+    fn to_stable_hash_key(&self, _: &CTX) -> SymbolStr {
+        self.clone()
+    }
+}