[COMMITTED 33/42] gccrs: Add hash function for Identifiers

[arthur . cohen]

From: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>

gcc/rust/ChangeLog:

        * ast/rust-ast.h: Add hash function.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>
---
 gcc/rust/ast/rust-ast.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/gcc/rust/ast/rust-ast.h b/gcc/rust/ast/rust-ast.h
index 94585dc1344..aa6ad5066aa 100644
--- a/gcc/rust/ast/rust-ast.h
+++ b/gcc/rust/ast/rust-ast.h
@@ -2102,6 +2102,19 @@ template <> struct less<Rust::Identifier>
     return lhs.as_string () < rhs.as_string ();
   }
 };
+
+template <> struct hash<Rust::Identifier>
+{
+  std::size_t operator() (const Rust::Identifier &k) const
+  {
+    using std::hash;
+    using std::size_t;
+    using std::string;
+
+    return hash<string> () (k.as_string ()) ^ (hash<int> () (k.get_locus ()));
+  }
+};
+
 } // namespace std
 
 #endif
-- 
2.49.0