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diff --git a/gcc/rust/expand/rust-macro-builtins-helpers.h b/gcc/rust/expand/rust-macro-builtins-helpers.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 GCCRS_RUST_MACRO_BUILTINS_HELPERS_H
+#define GCCRS_RUST_MACRO_BUILTINS_HELPERS_H
+#include "rust-ast-fragment.h"
+#include "rust-ast.h"
+#include "rust-cfg-strip.h"
+#include "rust-diagnostics.h"
+#include "rust-early-name-resolver.h"
+#include "rust-expr.h"
+#include "rust-lex.h"
+#include "rust-macro-builtins.h"
+#include "rust-macro-invoc-lexer.h"
+#include "rust-macro.h"
+#include "rust-parse.h"
+#include "rust-session-manager.h"
+#include "rust-system.h"
+#include "rust-token.h"
+namespace Rust {
+
+std::string
+make_macro_path_str (BuiltinMacro kind);
+
+std::vector<std::unique_ptr<AST::MacroInvocation>>
+check_for_eager_invocations (
+  std::vector<std::unique_ptr<AST::Expr>> &expressions);
+
+// Shorthand function for creating unique_ptr tokens
+
+std::unique_ptr<AST::Token>
+make_token (const TokenPtr tok);
+
+std::unique_ptr<AST::Expr>
+make_string (location_t locus, std::string value);
+// TODO: Is this correct?
+AST::Fragment
+make_eager_builtin_invocation (
+  BuiltinMacro kind, location_t locus, AST::DelimTokenTree arguments,
+  std::vector<std::unique_ptr<AST::MacroInvocation>> &&pending_invocations);
+// Match the end token of a macro given the start delimiter of the macro
+TokenId
+macro_end_token (AST::DelimTokenTree &invoc_token_tree,
+		 Parser<MacroInvocLexer> &parser);
+// Expand and then extract a string literal from the macro
+std::unique_ptr<AST::LiteralExpr>
+try_extract_string_literal_from_fragment (const location_t &parent_locus,
+					  std::unique_ptr<AST::Expr> &node);
+
+std::vector<std::unique_ptr<AST::Expr>>
+try_expand_many_expr (Parser<MacroInvocLexer> &parser,
+		      const TokenId last_token_id, MacroExpander *expander,
+		      bool &has_error);
+
+// Parse a single string literal from the given delimited token tree,
+//   and return the LiteralExpr for it. Allow for an optional trailing comma,
+//   but otherwise enforce that these are the only tokens.
+
+std::unique_ptr<AST::Expr>
+parse_single_string_literal (BuiltinMacro kind,
+			     AST::DelimTokenTree &invoc_token_tree,
+			     location_t invoc_locus, MacroExpander *expander);
+
+// Treat PATH as a path relative to the source file currently being
+// compiled, and return the absolute path for it.
+
+std::string
+source_relative_path (std::string path, location_t locus);
+
+// Read the full contents of the file FILENAME and return them in a vector.
+// FIXME: platform specific.
+tl::optional<std::vector<uint8_t>>
+load_file_bytes (location_t invoc_locus, const char *filename);
+} // namespace Rust
+#endif // GCCRS_RUST_MACRO_BUILTINS_HELPERS_H