Ah.  Yes.  That was the disconnect. Though I still don't know that I want
an AST vector. When I rewrite AST trees later, it won't be a desirable
retention mechanism.

Shap

On Sunday, June 14, 2015, Keean Schupke <[email protected]> wrote:

> I don't think you mean union in the same sense I do. I am not talking
> about a stack of type unions.
>
> I am talking about a stack that records unifications done (IE the
> union-find links made) so that they can be undone on backtracking.
>
> Keean.
>  On 14 Jun 2015 1:31 pm, "Jonathan S. Shapiro" <[email protected]
> <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:
>
>> On Thu, Jun 11, 2015 at 6:34 AM, Keean Schupke <[email protected]
>> <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:
>>
>>> This is what the union-stack is for, storing the original pointer
>>> addresses when you move bits of the tree around...
>>>
>>
>> The union stack is, in some sense, the problem we are trying to get rid
>> of!
>>
>> shap
>>
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>>
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