Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0728.cs

@@ -0,0 +1,19 @@
+// CS0728: Possibly incorrect assignment to `token' which is the argument to a using or lock statement
+// Line: 11
+// Compiler options: -warnaserror
+
+public class Foo
+{
+	public static void Main ()
+	{
+		object token = new object ();
+		lock (token)
+		{
+			Foo2 (ref token);
+		}
+	}
+	
+	static void Foo2 (ref object o)
+	{
+	}
+}