test/langtools/tools/javac/cast/8141343/T8141343.java

/*
 * @test /nodynamiccopyright/
 * @bug 8141343
 * @summary Subtle semantics changes for union types in cast conversion
 * @compile/fail/ref=T8141343.out -XDrawDiagnostics T8141343.java
 */

class T8141343 {
    interface Foo<X> { }

    static class A extends Exception implements Foo<A> { }
    static class B extends Exception implements Foo<B> { }

    void test(boolean cond) {
        try {
            if (cond) {
                throw new A();
            } else {
                throw new B();
            }
        } catch (A | B ex) {
            Foo<Integer> fa = (Foo<Integer>)ex;
        }
    }
}