Normative: Strictness check for object's SetMutableBinding

Fixes #2093
tc39 · Jul 14, 2020 · 0a0215d · 0a0215d
1 parent ff93a3e
commit 0a0215d
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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>