From 0a0215d52676290b7d6e5bcd8ee05364dd21c393 Mon Sep 17 00:00:00 2001
From: Leo Balter <leonardo.balter@gmail.com>
Date: Tue, 14 Jul 2020 10:45:06 -0700
Subject: [PATCH] Normative: Strictness check for object's SetMutableBinding

Fixes #2093
---
 spec.html | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/spec.html b/spec.html
index f4942239ff..883cd873b2 100644
--- a/spec.html
+++ b/spec.html
@@ -6551,6 +6551,9 @@ <h1>SetMutableBinding ( _N_, _V_, _S_ )</h1>
           <emu-alg>
             1. Let _envRec_ be the object Environment Record for which the method was invoked.
             1. Let _bindings_ be the binding object for _envRec_.
+            1. Let _value_ be ? HasProperty(_bindings_, _N_).
+            1. If _value_ is *false*, then
+              1. If _S_ is *true*, throw a *ReferenceError* exception.
             1. Return ? Set(_bindings_, _N_, _V_, _S_).
           </emu-alg>
         </emu-clause>