Imported Upstream version 3.10.0

Former-commit-id: 172c8e3c300b39d5785c7a3e8dfb08ebdbc1a99b

mcs/errors/cs8072.cs

@@ -0,0 +1,14 @@
+// CS8072: An expression tree cannot contain a null propagating operator
+// Line: 11
+
+using System;
+using System.Linq.Expressions;
+
+class C
+{
+	static int Main ()
+	{
+		Expression<Func<string, char?>> e = l => l?[1];
+		return 0;
+	}
+}