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diff --git a/gcc/rust/backend/rust-compile-fnparam.h b/gcc/rust/backend/rust-compile-fnparam.h
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+++ b/gcc/rust/backend/rust-compile-fnparam.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_FNPARAM
+#define RUST_COMPILE_FNPARAM
+
+#include "rust-compile-base.h"
+
+namespace Rust {
+namespace Compile {
+
+class CompileFnParam : private HIRCompileBase, protected HIR::HIRPatternVisitor
+{
+public:
+  static Bvariable *compile (Context *ctx, tree fndecl,
+			     HIR::FunctionParam *param, tree decl_type,
+			     Location locus);
+  static Bvariable *compile (Context *ctx, tree fndecl, HIR::Pattern *param,
+			     tree decl_type, Location locus);
+
+  void visit (HIR::IdentifierPattern &pattern) override;
+  void visit (HIR::WildcardPattern &pattern) override;
+  void visit (HIR::StructPattern &) override;
+  void visit (HIR::TupleStructPattern &) override;
+
+  // Empty visit for unused Pattern HIR nodes.
+  void visit (HIR::GroupedPattern &) override {}
+  void visit (HIR::LiteralPattern &) override {}
+  void visit (HIR::PathInExpression &) override {}
+  void visit (HIR::QualifiedPathInExpression &) override {}
+  void visit (HIR::RangePattern &) override {}
+  void visit (HIR::ReferencePattern &) override {}
+  void visit (HIR::SlicePattern &) override {}
+  void visit (HIR::TuplePattern &) override {}
+
+private:
+  CompileFnParam (Context *ctx, tree fndecl, tree decl_type, Location locus);
+
+  tree fndecl;
+  tree decl_type;
+  Location locus;
+  Bvariable *compiled_param;
+};
+
+class CompileSelfParam : private HIRCompileBase
+{
+public:
+  static Bvariable *compile (Context *ctx, tree fndecl, HIR::SelfParam &self,
+			     tree decl_type, Location locus);
+};
+
+} // namespace Compile
+} // namespace Rust
+
+#endif // RUST_COMPILE_FNPARAM