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diff --git a/gcc/rust/hir/tree/rust-hir-bound.h b/gcc/rust/hir/tree/rust-hir-bound.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_BOUND_H
+#define RUST_HIR_BOUND_H
+
+#include "rust-hir-bound-abstract.h"
+#include "rust-common.h"
+#include "rust-hir-path.h"
+
+namespace Rust {
+namespace HIR {
+
+// Represents a lifetime (and is also a kind of type param bound)
+class Lifetime : public TypeParamBound
+{
+private:
+  AST::Lifetime::LifetimeType lifetime_type;
+  std::string lifetime_name;
+  location_t locus;
+  Analysis::NodeMapping mappings;
+
+public:
+  // Constructor
+  Lifetime (Analysis::NodeMapping mapping, AST::Lifetime::LifetimeType type,
+	    std::string name, location_t locus)
+    : lifetime_type (type), lifetime_name (std::move (name)), locus (locus),
+      mappings (mapping)
+  {}
+
+  // Returns true if the lifetime is in an error state.
+  bool is_error () const
+  {
+    return lifetime_type == AST::Lifetime::LifetimeType::NAMED
+	   && lifetime_name.empty ();
+  }
+
+  static Lifetime error ()
+  {
+    return Lifetime (Analysis::NodeMapping::get_error (),
+		     AST::Lifetime::LifetimeType::NAMED, "", UNDEF_LOCATION);
+  }
+
+  std::string as_string () const override;
+
+  void accept_vis (HIRFullVisitor &vis) override;
+
+  WARN_UNUSED_RESULT const std::string &get_name () const
+  {
+    return lifetime_name;
+  }
+
+  AST::Lifetime::LifetimeType get_lifetime_type () const
+  {
+    return lifetime_type;
+  }
+
+  location_t get_locus () const override final { return locus; }
+
+  Analysis::NodeMapping get_mappings () const override final
+  {
+    return mappings;
+  }
+
+  BoundType get_bound_type () const final override { return LIFETIME; }
+
+protected:
+  /* Use covariance to implement clone function as returning this object rather
+   * than base */
+  Lifetime *clone_type_param_bound_impl () const override
+  {
+    return new Lifetime (*this);
+  }
+};
+
+} // namespace HIR
+} // namespace Rust
+
+#endif