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using System;
using System.Collections.Generic;
using System.Linq;
//
// Tests whether group i by i is optimized
//
class TestGroupBy
{
public static int Main ()
{
int[] int_array = new int [] { 0, 1, 2, 3, 4 };
var e = from i in int_array group i by i;
int c = 0;
foreach (var ig in e) {
Console.WriteLine (ig.Key);
if (ig.Key != c++)
return c;
}
Console.WriteLine ("OK");
return 0;
}
}
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