1 // Compiler options: -langversion:linq
2 // It tests collision between multiple external methods and also whether
3 // we import external methods when same namespace does not exist locally
5 using System.Collections.Generic;
10 public static void Main ()
12 List<int> first = null;
13 List<int> second = null;
15 IEnumerable<int> q = first.Except(second);