Export HashStable for DelimSpan, Lit and Path.

3 files changed, 13 insertions, 3 deletions

diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index a9f03e4af5b..01abd09aa91 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -33,6 +33,7 @@ use syntax_pos::symbol::{kw, sym, Symbol};
 use syntax_pos::{Span, DUMMY_SP, ExpnId};
 
 use rustc_data_structures::fx::FxHashSet;
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::thin_vec::ThinVec;
 use rustc_index::vec::Idx;
@@ -112,6 +113,15 @@ impl PartialEq<Symbol> for Path {
     }
 }
 
+impl<CTX> HashStable<CTX> for Path {
+    fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher) {
+        self.segments.len().hash_stable(hcx, hasher);
+        for segment in &self.segments {
+            segment.ident.name.hash_stable(hcx, hasher);
+        }
+    }
+}
+
 impl Path {
     // Convert a span and an identifier to the corresponding
     // one-segment path.
@@ -1411,7 +1421,7 @@ pub enum StrStyle {
 }
 
 /// An AST literal.
-#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable_Generic)]
 pub struct Lit {
     /// The original literal token as written in source code.
     pub token: token::Lit,
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index 8f091c06b4b..7865323f842 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -114,4 +114,4 @@ pub mod early_buffered_lints;
 /// Requirements for a `StableHashingContext` to be used in this crate.
 /// This is a hack to allow using the `HashStable_Generic` derive macro
 /// instead of implementing everything in librustc.
-pub trait StableHashingContextLike {}
+pub trait StableHashingContextLike: syntax_pos::StableHashingContextLike {}
diff --git a/src/libsyntax/tokenstream.rs b/src/libsyntax/tokenstream.rs
index 2201f1ed6ca..40f00aaa5d8 100644
--- a/src/libsyntax/tokenstream.rs
+++ b/src/libsyntax/tokenstream.rs
@@ -444,7 +444,7 @@ impl Cursor {
     }
 }
 
-#[derive(Debug, Copy, Clone, PartialEq, RustcEncodable, RustcDecodable)]
+#[derive(Debug, Copy, Clone, PartialEq, RustcEncodable, RustcDecodable, HashStable_Generic)]
 pub struct DelimSpan {
     pub open: Span,
     pub close: Span,