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using System;
using System.Collections.Generic;
using System.Linq.Expressions;
class Foo<T>
{
public bool ContainsAll<U> (IEnumerable<U> items) where U : T
{
foreach (U item in items) {
Expression<Func<bool>> e = () => !Contains (item);
if (!e.Compile () ())
return false;
}
return true;
}
public bool Contains (T t)
{
return false;
}
}
class Program
{
public static int Main ()
{
var x = new Foo<int> ();
return x.ContainsAll (new [] { 4, 6, 78 }) ? 0 : 1;
}
}
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