call method
Implementation
@override
Object? call(Interpreter interpreter, List<Object?> arguments,
Map<Symbol, Object?> namedArguments) {
if (arguments.length < 2) {
throw "arguments required in Timer";
}
return Timer.periodic(arguments.first as Duration, (timer) {
(arguments[1] as LoxFunction).call(interpreter, [TimerIns(timer)], {});
});
}