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[Simone Busoli <1051847@xxxxxxxxxxxxxxxxxx>]

I've done a simple implementation which allows for the usage specified
by the OP and in general considers enumerables which introduce recursion
as not equal.

Not sure it is really worth to add real support for recursive
enumerables and for explicity identity comparison in Contains
constraint, maybe the second is more desirable than the first though.

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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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