SOEInLeastUpperClass.java

<error descr="Cyclic inheritance involving 'A'">interface A extends A</error> {}
interface B {}

<error descr="Cyclic inheritance involving 'A'">class T implements A, B</error>{
    <T1> T1 foo(A a, B b) {
        return null;
    }

    void bar (boolean a, A a1, B b1){
        <error descr="Incompatible types. Found: 'java.lang.Object', required: 'T'">T t = a ? a1 : b1;</error>
    }
}