Currently, if an inner class has an error, the outer class will still
generate code:

public class Oops {
    class inner {
inner() {
System.out.println(method());
}

int method() {
return "hello";
}
    }

    public static void main(String[] args) {
new Oops().new inner();
    }
}

Compiling this yields Oops.class, but no Oops$inner.class.

This means that users of Makefiles need to list all inner classes as targets to ensure that they have an up-to-date project.

It would be nice if the main .class file could always be assumed to proxy for the rest of the nest.