Normative: Verify if Binding is preserved for obj's SetMutableBinding (…

…#2094) Verify binding existence in the object's SetMutableBinding on Strict Mode. Closes #2093 Ref #467 Ref tc39/test262#427
tc39 · Jul 30, 2020 · 019d498 · 019d498
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commit 019d498
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/spec.html b/spec.html
@@ -6626,6 +6626,8 @@ <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 _stillExists_ be ? HasProperty(_bindings_, _N_).
+            1. If _stillExists_ is *false* and _S_ is *true*, throw a *ReferenceError* exception.
             1. Return ? Set(_bindings_, _N_, _V_, _S_).
           </emu-alg>
         </emu-clause>