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[Simone Busoli <1051847@xxxxxxxxxxxxxxxxxx>]

One additional observation: if you think the two arrays in the previous
comment should be considered equal, how do you think these two should be
handled instead?

            object[] array1 = new object[2];
            array1[0] = array1;
            array1[1] = 1;

            object[] array2 = new object[2];
            array2[0] = array2;
            array2[1] = 1;

These are the same arrays as above, just with the elements in the
reverse order.

And what about these two?

            object[] array1 = new object[2];
            object[] array2 = new object[2];

            array1[0] = 1;
            array1[1] = array2;

            array2[0] = 1;
            array2[1] = array1;

-- 
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https://bugs.launchpad.net/bugs/1051847

Title:
  self contained item in array causes stack overflow

Status in NUnit V2 Test Framework:
  Confirmed

Bug description:
  using System.Collections;
  using System.Collections.Generic;
  using NUnit.Framework;

  [TestFixture]
  public class Reproduction {
  	class SelfContainer : IEnumerable { public IEnumerator GetEnumerator() { yield return this; } }

  	[Test]
  	public void SelfContainedItemFoundInArray() {
  		var item = new SelfContainer();
  		var items = new SelfContainer[] { new SelfContainer(), item };

  		// work around
  		Assert.True(((ICollection<SelfContainer>)items).Contains(item));

  		// causes StackOverflowException
  		Assert.Contains(item, items);
  	}
  }

  Reproduced in NUnit 2.6.1

  See also bug #491300

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