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diff --git a/gcc/rust/hir/tree/rust-hir-visitable.h b/gcc/rust/hir/tree/rust-hir-visitable.h
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+++ b/gcc/rust/hir/tree/rust-hir-visitable.h
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+// Copyright (C) 2020-2024 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_HIR_VISITABLE_H
+#define RUST_HIR_VISITABLE_H
+
+namespace Rust {
+namespace HIR {
+
+class HIRFullVisitor;
+class HIRTraitItemVisitor;
+class HIRImplVisitor;
+class HIRStmtVisitor;
+class HIRExpressionVisitor;
+class HIRTypeVisitor;
+class HIRPatternVisitor;
+
+class FullVisitable
+{
+public:
+  virtual void accept_vis (HIRFullVisitor &vis) = 0;
+};
+} // namespace HIR
+} // namespace Rust
+
+#endif