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// Compiler options: -langversion:experimental
using System;
class RecursivePattern
{
static int Main ()
{
object o = null;
bool b = o is C1 (8);
if (b)
return 1;
o = new C1 ();
b = o is C1 (-4);
if (b)
return 2;
b = o is C1 (8);
if (!b)
return 3;
b = o is C1 (C1 (9), C1 (8));
if (b)
return 4;
b = o is C1 (C1 (*), C1 (8));
if (!b)
return 41;
b = o is C1 (0);
if (b)
return 5;
ValueType vt = new S ();
b = vt is S (null, 0);
if (b)
return 6;
b = vt is S (8, 0);
if (b)
return 7;
b = vt is S (8, 2);
if (!b)
return 8;
Console.WriteLine ("ok");
return 0;
}
}
class C1
{
public static bool operator is (C1 c, out int x)
{
x = 8;
return true;
}
public static bool operator is (C1 c, out C1 c2, out C1 c3)
{
c2 = null;
c3 = null;
return true;
}
}
struct S
{
public static bool operator is (S s, out int? x, out decimal d)
{
x = 8;
d = 2;
return true;
}
}
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