From d27591806950034d8d3763a13db6f2c201311991 Mon Sep 17 00:00:00 2001
From: Gaming4JC <g4jc@hyperbola.info>
Date: Sun, 9 Jun 2019 01:48:29 -0400
Subject: 1339137 - Don't do Annex B lexical function behavior when redeclaring
 a parameter name in a function with parameter expressions.

---
 js/src/vm/Scope.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'js/src/vm/Scope.cpp')

diff --git a/js/src/vm/Scope.cpp b/js/src/vm/Scope.cpp
index a71c03695..0f80d7b69 100644
--- a/js/src/vm/Scope.cpp
+++ b/js/src/vm/Scope.cpp
@@ -669,6 +669,14 @@ FunctionScope::script() const
     return canonicalFunction()->nonLazyScript();
 }
 
+/* static */ bool
+FunctionScope::isSpecialName(ExclusiveContext* cx, JSAtom* name)
+{
+    return name == cx->names().arguments ||
+           name == cx->names().dotThis ||
+           name == cx->names().dotGenerator;
+}
+
 /* static */ Shape*
 FunctionScope::getEmptyEnvironmentShape(ExclusiveContext* cx, bool hasParameterExprs)
 {
-- 
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