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diff --git a/gcc/rust/expand/rust-derive-default.h b/gcc/rust/expand/rust-derive-default.h
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+++ b/gcc/rust/expand/rust-derive-default.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_DEFAULT_H
+#define RUST_DERIVE_DEFAULT_H
+
+#include "rust-derive.h"
+#include "rust-ast.h"
+
+namespace Rust {
+namespace AST {
+
+// This derive is currently incomplete and only generate a stub implementation
+// which does not do any debug formatting
+class DeriveDefault : DeriveVisitor
+{
+public:
+  DeriveDefault (location_t loc);
+
+  std::unique_ptr<Item> go (Item &);
+
+private:
+  std::unique_ptr<Item> expanded;
+
+  std::unique_ptr<Expr> default_call (std::unique_ptr<Type> &&type);
+
+  std::unique_ptr<AssociatedItem>
+  default_fn (std::unique_ptr<Expr> &&return_expr);
+
+  std::unique_ptr<Item> default_impl (
+    std::unique_ptr<AssociatedItem> &&default_fn, std::string name,
+    const std::vector<std::unique_ptr<GenericParam>> &type_generics);
+
+  virtual void visit_struct (StructStruct &struct_item) override;
+  virtual void visit_tuple (TupleStruct &tuple_item) override;
+  virtual void visit_enum (Enum &enum_item) override;
+  virtual void visit_union (Union &enum_item) override;
+};
+
+} // namespace AST
+} // namespace Rust
+
+#endif // ! RUST_DERIVE_DEFAULT_H