From 59dc29f3f0e950e33a612c83cd5e9b085283fd3f Mon Sep 17 00:00:00 2001
From: Marijn Haverbeke <marijnh@gmail.com>
Date: Wed, 4 Mar 2015 15:29:15 +0100
Subject: [PATCH] In ES6-mode, don't treat keywords with escaped characters as
 regular identifiers

See https://mathiasbynens.be/notes/javascript-identifiers-es6
---
 acorn.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/acorn.js b/acorn.js
index 979b9317de..c6341b605e 100644
--- a/acorn.js
+++ b/acorn.js
@@ -1269,7 +1269,7 @@
   function readWord() {
     var word = readWord1();
     var type = _name;
-    if (!containsEsc && isKeyword(word))
+    if ((options.ecmaVersion >= 6 || !containsEsc) && isKeyword(word))
       type = keywordTypes[word];
     return finishToken(type, word);
   }