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Auto-increment

From: Daniel Shahaf <d.s@xxxxxxxxxxxxxxxxxx>
>
> P.P.S. I wasn't going to commit the above, and it has some quirks (for
> example, evaluating ${+autoincrement} increments the parameter), but if
> there's interest let me know.


Is there a reason using $[a++] or $[++a] isn't good enough?
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