call method
Implementation
@override
Object? call(Interpreter interpreter, List<Object?> arguments,
Map<Symbol, Object?> namedArguments) {
if (arguments.isEmpty) {
throw "Missing argument: callback";
}
var listener = stream.listen((result) {
(arguments[0] as LoxFunction).call(interpreter, [result], {});
});
return StreamListenerHandler(listener);
}