This program wrongly generates an 'illegal forward reference' error (at obj's declaration...even if the error was justified, it should occur at obj's use) :-

class Huh {
    Runnable r = new Runnable() {
        public void run() {
            Object o = obj;
        }
    };
    final Object obj = r;
}

The following program is morally equivalent (the JLS treats instance variable initializers and instance initializers uniformly) and does not generate an error:

class Huh {
    Runnable r;
    {
        r = new Runnable() {
            public void run() {
                Object o = obj;
            }
        };
    }
    final Object obj = r;
}
Simpler test case, given the following program

class Test {
    final int a = b;
    final int b = a;
}

the compiler should report only ONE error, instead of two, as it can be seen from the output:

Test.java:33: illegal forward reference
    final int a = b;
                  ^
Test.java:34: illegal forward reference
    final int b = a;
                  ^
2 errors

While the first error is correct, the second one is a bug, accordingly to JLS 8.3.2.3