toArray(IntFunction<String []>) in Stream cannot be applied

Searched around and I could not find a good answer to this question.

Intellij IDEA 14.1.4 is giving me red underline error on code that compiles and runs fine.

Stream.concat(Arrays.stream(new String[] {"a", "b", "c"}), Arrays.stream(new String[] {"x", "y", "z"}))
                .toArray(String[]::new);

Basically, any time you use the Object[]::new IntFunction Intellij balks on it.

Intellij recognizes this format.

Stream.concat(Arrays.stream(new String[] {"a", "b", "c"}), Arrays.stream(new String[] {"x", "y", "z"}))
                .toArray(size -> new String[size]);

Is there some setting I am missing or does intellij not recognize the new style IntFunction yet?