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using System;
using System.Linq.Expressions;
struct S<T> where T : struct
{
public static int Test ()
{
Expression<Func<T?, bool>> e = (T? o) => o == null;
if (!e.Compile ().Invoke (null))
return 1;
if (e.Compile ().Invoke (default (T)))
return 2;
Console.WriteLine ("OK");
return 0;
}
}
class C
{
public static int Main()
{
return S<int>.Test ();
}
}
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