From 691fb57806a74a512142e8897fb4a6a440440a2d Mon Sep 17 00:00:00 2001
From: Ronald Brill <rbri@rbri.de>
Date: Wed, 20 Apr 2022 10:47:40 +0200
Subject: [PATCH] treat const as let in for-of loops to work around
 https://github.com/HtmlUnit/htmlunit/issues/449

---
 src/org/mozilla/javascript/Parser.java | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/org/mozilla/javascript/Parser.java b/src/org/mozilla/javascript/Parser.java
index d8310e846d..06ca941cfc 100644
--- a/src/org/mozilla/javascript/Parser.java
+++ b/src/org/mozilla/javascript/Parser.java
@@ -1593,6 +1593,17 @@ private AstNode forLoopInit(int tt) throws IOException {
             } else if (tt == Token.VAR || tt == Token.LET) {
                 consumeToken();
                 init = variables(tt, ts.tokenBeg, false);
+
+            // HtmlUnit - HACK
+            // allow const in for-of loop's by treating them as let
+            // see JavaScriptEngine2Test.constInOfLoop()
+            //
+            // HtmlUnit - HACK
+            } else if (tt == Token.CONST) {
+                consumeToken();
+                init = variables(Token.LET, ts.tokenBeg, false);
+            // HtmlUnit - HACK
+
             } else {
                 init = expr();
             }