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using System; class A { static int M (string s, object o) { return 1; } static int M (string s, params object[] o) { if (o != null) return 2; return 0; } public static int Main () { if (M ("x", null) != 0) return 1; if (M ("x", (object[])null) != 0) return 2; if (M ("x", (dynamic)null) != 0) return 3; return 0; } }