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diff --git a/gcc/rust/expand/rust-derive-hash.h b/gcc/rust/expand/rust-derive-hash.h
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+// Copyright (C) 2025 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+// for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#ifndef RUST_DERIVE_HASH_H
+#define RUST_DERIVE_HASH_H
+
+#include "rust-derive.h"
+
+namespace Rust {
+namespace AST {
+
+class DeriveHash : DeriveVisitor
+{
+public:
+  DeriveHash (location_t loc);
+
+  std::unique_ptr<AST::Item> go (Item &item);
+
+private:
+  std::unique_ptr<Item> expanded;
+
+  constexpr static const char *state = "#state";
+  constexpr static const char *state_type = "#__H";
+  constexpr static const char *discr = "#discr";
+
+  std::unique_ptr<Expr> hash_call (std::unique_ptr<Expr> &&value);
+  std::unique_ptr<AssociatedItem> hash_fn (std::unique_ptr<BlockExpr> &&block);
+  std::unique_ptr<Item>
+  hash_impl (std::unique_ptr<AssociatedItem> &&hash_fn, std::string name,
+	     const std::vector<std::unique_ptr<GenericParam>> &type_generics);
+
+  MatchCase match_enum_tuple (PathInExpression variant_path,
+			      const EnumItemTuple &variant);
+  MatchCase match_enum_struct (PathInExpression variant_path,
+			       const EnumItemStruct &variant);
+
+  virtual void visit_struct (StructStruct &item);
+  virtual void visit_tuple (TupleStruct &item);
+  virtual void visit_enum (Enum &item);
+  virtual void visit_union (Union &item);
+};
+
+} // namespace AST
+} // namespace Rust
+
+#endif // ! RUST_DERIVE_HASH_H