The following fails to compile:

---

public class FirstNonNull {

public static class C<T> {}

public static <T> T firstNonNull(T first, T second) {
    return first != null ? first : second;
}

public static C<String> doesNotCompile = firstNonNull(new C<String>(), new C<>());

}

---

Error:

public static C<String> doesNotCompile = firstNonNull(new C<String>(), new C<>());
                                                     ^
    inferred: C<? extends Object>
    upper bound(s): C<String>,Object

---

This is a regression -- it compiles correctly with the initial release of JDK 8.

Reported on Stack Overflow: http://stackoverflow.com/questions/25490581