5 public static int Main ()
8 bool r
= o
is System
.String t1
;
16 bool r3
= l
is long t4
;
21 Console
.WriteLine ("ok");
25 static void Test1 (object arg
)
27 while (arg
is int b
) {
32 static string Test2 (object arg
)
34 if (arg
is string s
) {