Imported Upstream version 5.8.0.22

Former-commit-id: df344e34b07851d296efb3e6604c8db42b6f7aa3

mcs/errors/cs8129.cs

@@ -0,0 +1,20 @@
+// CS8129:
+// Line:
+
+using System;
+
+class C
+{
+	static void Main ()
+	{
+		long x;
+		string y;
+		(x, y) = new C ();
+	}
+
+	public static void Deconstruct (out int a, out string b)
+	{
+		a = 1;
+		b = "hello";
+	}
+}