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diff --git a/gcc/rust/backend/rust-compile-item.h b/gcc/rust/backend/rust-compile-item.h
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+++ b/gcc/rust/backend/rust-compile-item.h
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+// Copyright (C) 2020-2022 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_COMPILE_ITEM
+#define RUST_COMPILE_ITEM
+
+#include "rust-compile-base.h"
+
+namespace Rust {
+namespace Compile {
+
+class CompileItem : private HIRCompileBase, protected HIR::HIRStmtVisitor
+{
+protected:
+public:
+  static tree compile (HIR::Item *item, Context *ctx,
+		       TyTy::BaseType *concrete = nullptr,
+		       bool is_query_mode = false,
+		       Location ref_locus = Location ())
+  {
+    CompileItem compiler (ctx, concrete, ref_locus);
+    item->accept_vis (compiler);
+
+    if (is_query_mode && compiler.reference == error_mark_node)
+      rust_internal_error_at (ref_locus, "failed to compile item: %s",
+			      item->as_string ().c_str ());
+
+    return compiler.reference;
+  }
+
+  void visit (HIR::StaticItem &var) override;
+  void visit (HIR::ConstantItem &constant) override;
+  void visit (HIR::Function &function) override;
+  void visit (HIR::ImplBlock &impl_block) override;
+  void visit (HIR::ExternBlock &extern_block) override;
+  void visit (HIR::Module &module) override;
+
+  // Empty visit for unused Stmt HIR nodes.
+  void visit (HIR::TupleStruct &) override {}
+  void visit (HIR::EnumItem &) override {}
+  void visit (HIR::EnumItemTuple &) override {}
+  void visit (HIR::EnumItemStruct &) override {}
+  void visit (HIR::EnumItemDiscriminant &) override {}
+  void visit (HIR::TypePathSegmentFunction &) override {}
+  void visit (HIR::TypePath &) override {}
+  void visit (HIR::QualifiedPathInType &) override {}
+  void visit (HIR::ExternCrate &) override {}
+  void visit (HIR::UseDeclaration &) override {}
+  void visit (HIR::TypeAlias &) override {}
+  void visit (HIR::StructStruct &) override {}
+  void visit (HIR::Enum &) override {}
+  void visit (HIR::Union &) override {}
+  void visit (HIR::Trait &) override {}
+  void visit (HIR::EmptyStmt &) override {}
+  void visit (HIR::LetStmt &) override {}
+  void visit (HIR::ExprStmtWithoutBlock &) override {}
+  void visit (HIR::ExprStmtWithBlock &) override {}
+
+protected:
+  CompileItem (Context *ctx, TyTy::BaseType *concrete, Location ref_locus)
+    : HIRCompileBase (ctx), concrete (concrete), reference (error_mark_node),
+      ref_locus (ref_locus)
+  {}
+
+  TyTy::BaseType *concrete;
+  tree reference;
+  Location ref_locus;
+};
+
+} // namespace Compile
+} // namespace Rust
+
+#endif // RUST_COMPILE_ITEM