Imported Upstream version 5.8.0.22

Former-commit-id: df344e34b07851d296efb3e6604c8db42b6f7aa3

mcs/errors/cs8139-3.cs

@@ -0,0 +1,16 @@
+// CS8139: `D.M((int, int))': cannot change tuple element names when overriding inherited member `C.M((int, int))'
+// Line: 13
+
+class C
+{
+	public virtual void M ((int, int) arg)
+	{
+	}
+}
+
+class D : C
+{
+	public override void M ((int c, int d) arg)
+	{
+	}
+}