Exception handling

[ANtlord via Digitalmars-d-learn]

Hello! I've tried to use nothrow keyword and I couldn't get a 
state of function satisfied the keyword. I have one more method 
that can throw an exception; it is called inside nothrow method. 
Every type of an exception from the throwable method is handled 
by the nothow method.

ubyte throwable_fn(ubyte state) {
	if(state < 2) {
		return 1;
	} else if(state == 3) {
		throw new MyException1("qwe");
	} else {
		throw new MyException2("asd");
	}
}

void nothrowable_fn() nothrow {
	try {
		auto val = throwable_fn(3);
		// do success staff
	} catch(MyException1 e) {
		// handle error 1
	} catch(MyException2 e) {
		// handle error 2
	}
}


I can't compile this. I get an error says nothrowable_fn function 
can't be nothrow. I get the message until I handle Exception 
class. But it is not appropriate for me because I can get another 
exception of another type. I mean case when code will be updated 
and new exceptions will come with a new piece of code.

How can I achieve nothrow statement without catching of an 
instance of Exception class? Thanks. Sorry if my English is not 
clear.