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diff --git a/gcc/rust/resolve/rust-ast-resolve-struct-expr-field.h b/gcc/rust/resolve/rust-ast-resolve-struct-expr-field.h
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+++ b/gcc/rust/resolve/rust-ast-resolve-struct-expr-field.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_AST_RESOLVE_STRUCT_EXPR_FIELD
+#define RUST_AST_RESOLVE_STRUCT_EXPR_FIELD
+
+#include "rust-ast-resolve-base.h"
+#include "rust-ast-full.h"
+
+namespace Rust {
+namespace Resolver {
+
+// this resolves values being assigned not that the field actually exists yet.
+
+class ResolveStructExprField : public ResolverBase
+{
+  using Rust::Resolver::ResolverBase::visit;
+
+public:
+  static void go (AST::StructExprField *field, const CanonicalPath &prefix,
+		  const CanonicalPath &canonical_prefix);
+
+  void visit (AST::StructExprFieldIdentifierValue &field) override;
+
+  void visit (AST::StructExprFieldIndexValue &field) override;
+
+  void visit (AST::StructExprFieldIdentifier &field) override;
+
+private:
+  ResolveStructExprField (const CanonicalPath &prefix,
+			  const CanonicalPath &canonical_prefix);
+
+  const CanonicalPath &prefix;
+  const CanonicalPath &canonical_prefix;
+};
+
+} // namespace Resolver
+} // namespace Rust
+
+#endif // RUST_AST_RESOLVE_STRUCT_EXPR_FIELD