On Fri, Jul 3, 2009 at 3:13 AM, Tim Starling<[email protected]> wrote:
> Loops are essential for readable code. There is no problem with
> allowing loops in conjunction with time limits, that we don't have
> already with complex templates. In fact, time limits for complex
> templates would be an improvement over the system of expansion limits
> we have at the moment.

But time limits are inconsistent.  Whether a template hits the limit
might depend on whether it happens to be running on an Apache with a
Pentium IV, an Opteron, a Xeon, . . .

> Recursion can give a long running time even if the depth is limited.
> By calling the function multiple times from its own body, you can have
> exponential time order in the recursion depth.

You can also have exponential time with loops.

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