Imported Upstream version 5.10.0.69

Former-commit-id: fc39669a0b707dd3c063977486506b6793da2890

mcs/tests/gtest-409.cs

@@ -1,3 +1,4 @@
+// Compiler options: -langversion:latest
 using System;
 
 //
@@ -175,6 +176,11 @@ public class ConditionalParsing
 		var x = args ?.2f : -.2f;
 	}
 
+	void Test_23 (string args)
+	{
+		var x = args == null ? default : 1;
+	}
+
 	static void Helper<T> (T arg)
 	{
 	}