public void SelectFromEach4_SelectorNull () { IEnumerable<int> s2 = new[]{2}; IEnumerable<int> s3 = new[]{3}; IEnumerable<int> s4 = new[]{4}; Func<int,int,int,int,string> f = null; new[]{1}.SelectFromEach (s2, s3, s4, f); }