langtools/test/tools/javac/lambda/TargetType28.java

/*
 * @test /nodynamiccopyright/
 * @bug 8003280
 * @summary Add lambda tests
 *  target type inference in a case where lambda expression returns diamond
 * @compile/fail/ref=TargetType28.out -XDrawDiagnostics TargetType28.java
 */

class TargetType28 {
    static class SuperFoo<X> {}

    static class Foo<X extends Number> extends SuperFoo<X> {}

    interface A<X, Y> {
       SuperFoo<Y> m(X x);
    }

    <Z, R> SuperFoo<R> apply(A<Z, R> ax, Z x) { return null; }

    SuperFoo<String> ls = apply(x-> new Foo<>(), 1);
    SuperFoo<Integer> li = apply(x-> new Foo<>(), 1);
    SuperFoo<?> lw = apply(x-> new Foo<>(), 1);
}