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class Foo extends Exception {}
class SonOfFoo extends Foo {}
class DaughterOfFoo extends Foo {}

class Test {
    void test() {
        try {
            throw new DaughterOfFoo();
        } catch (final Foo exception) {
            try {
                throw exception; // first incompatibility
            } catch (SonOfFoo anotherException) {
                // second incompatibility: is this block reachable?
            }
        }
    }
}