Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-343.cs

@@ -0,0 +1,9 @@
+using System;
+
+class X {
+	static void Concat (string s1, string s2, string s3) { }
+	static void Concat (params string [] ss) {
+		throw new Exception ("Overload resolution failed");
+	}
+	public static void Main () { Concat ("a", "b", "c"); }
+}