Confused about class equality

[strtr]

Justin Spahr-Summers Wrote:
> 
> I think he said that he has two distinct object references, but the 
> value stored in the object(s) changes by changing either one.
> 
> In other words, we'd need to see the code.

I've added this exact sequence:

	if( c1 !is null )
	{
		c1.value = 1;
		if( c2 !is null )
		{
			c2.value = 2;
			
			if( c1 !is c2 )
			{
				c1.value = 3;
				assert(c2.value == 2 );
			}
			c2.value = 0;
		}
		c1.value = 0;
	}

To my understanding this should never fails, yet it does.
AssertError Failure