diff --git a/mcs/errors/gcs0266-5.cs b/mcs/errors/gcs0266-5.cs
new file mode 100644
index 000000000000..93eeca1a986b
--- /dev/null
+++ b/mcs/errors/gcs0266-5.cs
@@ -0,0 +1,20 @@
+// CS0266: Cannot implicitly convert type `S?' to `A'. An explicit conversion exists (are you missing a cast?)
+// Line: 9
+
+struct S
+{
+	public static int Main ()
+	{
+		S? s = null;
+		A a = s;
+		return 0;
+	}
+}
+
+struct A
+{
+	public static implicit operator A (S x)
+	{
+		return new A ();
+	}
+}