LibJS: Convert set_immutable_prototype() to ThrowCompletionOr

Userland/Libraries/LibJS/Runtime/Object.cpp

@@ -841,12 +841,12 @@ ThrowCompletionOr<MarkedValueList> Object::internal_own_property_keys() const
 }
 
 // 10.4.7.2 SetImmutablePrototype ( O, V ), https://tc39.es/ecma262/#sec-set-immutable-prototype
-bool Object::set_immutable_prototype(Object* prototype)
+ThrowCompletionOr<bool> Object::set_immutable_prototype(Object* prototype)
 {
     // 1. Assert: Either Type(V) is Object or Type(V) is Null.
 
     // 2. Let current be ? O.[[GetPrototypeOf]]().
-    auto* current = TRY_OR_DISCARD(internal_get_prototype_of());
+    auto* current = TRY(internal_get_prototype_of());
 
     // 3. If SameValue(V, current) is true, return true.
     if (prototype == current)

Userland/Libraries/LibJS/Runtime/Object.h

@@ -108,7 +108,7 @@ public:
 
     // 10.4.7 Immutable Prototype Exotic Objects, https://tc39.es/ecma262/#sec-immutable-prototype-exotic-objects
 
-    bool set_immutable_prototype(Object* prototype);
+    ThrowCompletionOr<bool> set_immutable_prototype(Object* prototype);
 
     // 20.1 Object Objects, https://tc39.es/ecma262/#sec-object-objects
 

Userland/Libraries/LibJS/Runtime/ObjectPrototype.cpp

@@ -55,6 +55,7 @@ ObjectPrototype::~ObjectPrototype()
 // 10.4.7.1 [[SetPrototypeOf]] ( V ), https://tc39.es/ecma262/#sec-immutable-prototype-exotic-objects-setprototypeof-v
 ThrowCompletionOr<bool> ObjectPrototype::internal_set_prototype_of(Object* prototype)
 {
+    // 1. Return ? SetImmutablePrototype(O, V).
     return set_immutable_prototype(prototype);
 }
 

Userland/Libraries/LibWeb/Bindings/LocationObject.cpp

@@ -141,7 +141,7 @@ JS_DEFINE_NATIVE_FUNCTION(LocationObject::replace)
 JS::ThrowCompletionOr<bool> LocationObject::internal_set_prototype_of(Object* prototype)
 {
     // 1. Return ! SetImmutablePrototype(this, V).
-    return set_immutable_prototype(prototype);
+    return MUST(set_immutable_prototype(prototype));
 }
 
 // https://html.spec.whatwg.org/multipage/history.html#location-isextensible