Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

mcs/errors/cs8093.cs

@@ -0,0 +1,42 @@
+// CS8093: An argument to nameof operator cannot be extension method group
+// Line: 35
+
+using System;
+
+public class A
+{
+}
+
+namespace N1
+{
+	public static class X
+	{
+		public static string Extension (this A a, long x)
+		{
+			return null;
+		}
+		
+		public static string Extension (this A a, int x)
+		{
+			return null;
+		}
+	}
+}
+
+namespace N2
+{
+	using N1;
+	
+	public class Program
+	{
+		public static int Main ()
+		{
+			A a = null;
+			const string n = nameof (a.Extension);
+			if (n != "Extension")
+				return 1;
+
+			return 0;
+		}
+	}
+}