LibJS: Convert IteratorComplete AO to ThrowCompletionOr

Userland/Libraries/LibJS/Bytecode/Op.cpp

@@ -149,9 +149,10 @@ void IteratorToArray::execute_impl(Bytecode::Interpreter& interpreter) const
             return;
         auto* iterator_result = iterator_result_or_error.release_value();
 
-        auto complete = iterator_complete(global_object, *iterator_result);
-        if (vm.exception())
+        auto complete_or_error = iterator_complete(global_object, *iterator_result);
+        if (complete_or_error.is_error())
             return;
+        auto complete = complete_or_error.release_value();
 
         if (complete) {
             interpreter.accumulator() = array;
@@ -506,7 +507,13 @@ void IteratorResultDone::execute_impl(Bytecode::Interpreter& interpreter) const
     if (iterator_result_or_error.is_error())
         return;
     auto* iterator_result = iterator_result_or_error.release_value();
-    interpreter.accumulator() = Value(iterator_complete(interpreter.global_object(), *iterator_result));
+
+    auto complete_or_error = iterator_complete(interpreter.global_object(), *iterator_result);
+    if (complete_or_error.is_error())
+        return;
+    auto complete = complete_or_error.release_value();
+
+    interpreter.accumulator() = Value(complete);
 }
 
 void IteratorResultValue::execute_impl(Bytecode::Interpreter& interpreter) const

Userland/Libraries/LibJS/Runtime/IteratorOperations.cpp

@@ -57,12 +57,12 @@ ThrowCompletionOr<Object*> iterator_next(Object& iterator, Value value)
 }
 
 // 7.4.3 IteratorComplete ( iterResult ), https://tc39.es/ecma262/#sec-iteratorcomplete
-bool iterator_complete(GlobalObject& global_object, Object& iterator_result)
+ThrowCompletionOr<bool> iterator_complete(GlobalObject& global_object, Object& iterator_result)
 {
     auto& vm = global_object.vm();
 
     // 1. Return ! ToBoolean(? Get(iterResult, "done")).
-    return TRY_OR_DISCARD(iterator_result.get(vm.names.done)).to_boolean();
+    return TRY(iterator_result.get(vm.names.done)).to_boolean();
 }
 
 // 7.4.4 IteratorValue ( iterResult ), https://tc39.es/ecma262/#sec-iteratorvalue
@@ -77,13 +77,8 @@ Value iterator_value(GlobalObject& global_object, Object& iterator_result)
 // 7.4.5 IteratorStep ( iteratorRecord ), https://tc39.es/ecma262/#sec-iteratorstep
 ThrowCompletionOr<Object*> iterator_step(GlobalObject& global_object, Object& iterator)
 {
-    auto& vm = global_object.vm();
-
     auto* result = TRY(iterator_next(iterator));
-
-    auto done = iterator_complete(global_object, *result);
-    if (auto* exception = vm.exception())
-        return throw_completion(exception->value());
+    auto done = TRY(iterator_complete(global_object, *result));
 
     if (done)
         return nullptr;

Userland/Libraries/LibJS/Runtime/IteratorOperations.h

@@ -22,7 +22,7 @@ enum class IteratorHint {
 ThrowCompletionOr<Object*> get_iterator(GlobalObject&, Value value, IteratorHint hint = IteratorHint::Sync, Value method = {});
 ThrowCompletionOr<Object*> iterator_next(Object& iterator, Value value = {});
 ThrowCompletionOr<Object*> iterator_step(GlobalObject&, Object& iterator);
-bool iterator_complete(GlobalObject&, Object& iterator_result);
+ThrowCompletionOr<bool> iterator_complete(GlobalObject&, Object& iterator_result);
 Value iterator_value(GlobalObject&, Object& iterator_result);
 void iterator_close(Object& iterator);
 Object* create_iterator_result_object(GlobalObject&, Value value, bool done);

Userland/Libraries/LibJS/Runtime/PromiseConstructor.cpp

@@ -72,7 +72,7 @@ static bool iterator_record_is_complete(GlobalObject& global_object, Object& ite
     // FIXME: Create a native iterator structure with the [[Done]] internal slot. For now, temporarily clear
     //        the exception so we can access the "done" property on the iterator object.
     TemporaryClearException clear_exception(vm);
-    return iterator_complete(global_object, iterator_record);
+    return MUST(iterator_complete(global_object, iterator_record));
 }
 
 static void set_iterator_record_complete(GlobalObject& global_object, Object& iterator_record)