From adec9f4b8ee4cac6ba682330b83540a0e988e73b Mon Sep 17 00:00:00 2001
From: Ingvar Stepanyan <me@rreverser.com>
Date: Wed, 17 Dec 2014 20:37:00 +0200
Subject: [PATCH] Provide better error on member expression in binding's left
 side.

---
 acorn.js | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/acorn.js b/acorn.js
index 291f7b414c..3f15583c13 100644
--- a/acorn.js
+++ b/acorn.js
@@ -1489,14 +1489,12 @@
     switch (expr.type) {
       case "Identifier":
         if (strict && (isStrictBadIdWord(expr.name) || isStrictReservedWord(expr.name)))
-          raise(expr.start, isBinding
-            ? "Binding " + expr.name + " in strict mode"
-            : "Assigning to " + expr.name + " in strict mode"
-          );
+          raise(expr.start, (isBinding ? "Binding " : "Assigning to ") + expr.name + " in strict mode");
         break;
 
       case "MemberExpression":
-        if (!isBinding) break;
+        if (isBinding) raise(expr.start, "Binding to member expression");
+        break;
 
       case "ObjectPattern":
         for (var i = 0; i < expr.properties.length; i++)