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diff --git a/js/src/frontend/FoldConstants.h b/js/src/frontend/FoldConstants.h
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+++ b/js/src/frontend/FoldConstants.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef frontend_FoldConstants_h
+#define frontend_FoldConstants_h
+
+#include "frontend/SyntaxParseHandler.h"
+
+namespace js {
+namespace frontend {
+
+// Perform constant folding on the given AST. For example, the program
+// `print(2 + 2)` would become `print(4)`.
+//
+// pnp is the address of a pointer variable that points to the root node of the
+// AST. On success, *pnp points to the root node of the new tree, which may be
+// the same node (unchanged or modified in place) or a new node.
+//
+// Usage:
+//    pn = parser->statement();
+//    if (!pn)
+//        return false;
+//    if (!FoldConstants(cx, &pn, parser))
+//        return false;
+MOZ_MUST_USE bool
+FoldConstants(ExclusiveContext* cx, ParseNode** pnp, Parser<FullParseHandler>* parser);
+
+inline MOZ_MUST_USE bool
+FoldConstants(ExclusiveContext* cx, SyntaxParseHandler::Node* pnp,
+              Parser<SyntaxParseHandler>* parser)
+{
+    return true;
+}
+
+} /* namespace frontend */
+} /* namespace js */
+
+#endif /* frontend_FoldConstants_h */