[PATCH] parser: avoid IndexError: tuple index out of range

[Matt Mackall]

On Fri, 2010-06-18 at 15:14 +0300, timeless wrote:
> I was playing around with revsets and hit:
> 
> hg log -r 'ancestor(1::5) !'

Good spotting, I've queued a similar fix.

-- 
Mathematics is the supreme nostalgia of our time.