C# : AddJoin question

[philstopford]

I'm not sure whether this was intended or not, but AddJoin constructs a Joiner without assigning it to anything, and seemingly without utilizing it :

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    private void AddJoin(OutPt op1, OutPt op2)
    {
      if ((op1.outrec == op2.outrec) && ((op1 == op2) ||
        // unless op1.next or op1.prev crosses the start-end divide
        // don't waste time trying to join adjacent vertices
        ((op1.next == op2) && (op1 != op1.outrec.pts)) ||
        ((op2.next == op1) && (op2 != op1.outrec.pts)))) return;
        
      new Joiner(_joinerList, op1, op2, null);
    }

Is this intended?

[AngusJohnson]

It actually assigns itself to _joinerList.
Sometimes (often) I write code that seems neat at the time but later realise is confusing.
And I think this is an example 😕.
Anyhow, it does work, but I can see why you're confused.
I'll probably fix this so it'll be easier to understand.