[MERGE] Improve tests for the behaviour of Tree.iter_changes for missing paths that are only present in one tree, and fix found bugs. (Robert Collins)

[Robert Collins]

On Thu, 2008-08-14 at 11:05 +0900, Stephen J. Turnbull wrote:
> Robert Collins writes:
> 
>  > That would make it less objectionable for me. But still - this is not an
>  > *exceptional* circumstance; using exceptions for situation-normal flow
>  > control is pretty ugly IMO.
> 
> I suppose you've complained to the BDFL, then?<wink>  I'm referring to
> GeneratorExit and StopIteration, of course.

I don't think GeneratorExit is something ever raised by user code is it?
I mean, if I write to the byte-code, sure.

StopIteration is more interesting, but in fact - it is exceptional for
an iterator to end, because you don't know when that is going to be, but
control has returned to you. Using a sentinel may well be cleaner, but -
that, like generator exit, entirely hidden from [most] user code.

-Rob

-- 
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