+class C : B
+{
+ public static bool operator + (C a, short b)
+ {
+ return false;
+ }
+
+ public static bool operator + (C a, long b)
+ {
+ return false;
+ }
+}
+
+class B
+{
+ public static bool operator + (B b, string s)
+ {
+ return false;
+ }
+}
+
+public class Test
+{
+ public static void Main ()
+ {
+ var c = new C ();
+ var a1 = c + "a";
+ var a2 = c + "a";
+ }
+}
\ No newline at end of file