Imported Upstream version 5.8.0.22

Former-commit-id: df344e34b07851d296efb3e6604c8db42b6f7aa3

mcs/errors/cs8142.cs

@@ -0,0 +1,14 @@
+// CS8142: A partial method declaration and partial method implementation must both use the same tuple element names
+// Line: 11
+
+partial class X
+{
+	partial void Foo ((int a, int b) arg);
+}
+
+partial class X
+{
+	partial void Foo ((int c, int d) arg)
+	{
+	}
+}