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using System;
struct S
{
public static implicit operator string (S s)
{
return "1";
}
public static implicit operator short? (S s)
{
return 1;
}
public static implicit operator E (S s)
{
return 0;
}
}
public enum E
{
}
class C
{
public static int Main ()
{
E? e = 0;
const E e1 = (E)44;
var res = e == e1;
if (res != false)
return 1;
res = e1 == e;
if (res != false)
return 2;
E e2 = 0;
S s;
var res2 = e2 & s;
if (res2 != 0)
return 3;
res2 = s & e2;
if (res2 != 0)
return 4;
return 0;
}
}
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