Imported Upstream version 5.10.0.69

Former-commit-id: fc39669a0b707dd3c063977486506b6793da2890

mcs/tests/test-tuple-09.cs

@@ -0,0 +1,19 @@
+using System;
+
+class TupleDeconstructionDeclaration
+{
+	public static int Main ()
+	{
+		(string s, long l) = GetValues ();
+		(var vs, var vl) = GetValues ();
+		(object o, var vl2) = GetValues ();
+		(string ds, _) = GetValues ();
+
+		return 0;
+	}
+
+	static (string, long) GetValues ()
+	{
+		return ("a", 3);
+	}
+}