[issue1538691] Patch cElementTree to export CurrentLineNumber

[Robin Bryce]

Robin Bryce <robinbryce at gmail.com> added the comment:

> In the upstream 1.0.6, the ParseError exception has a position attribute
> that contains a (line, column) tuple.

That's fine for errors in the xml domain. Its not enough if I'm
reporting errors in the application domain - where I wont have a handy
exception to interrogate. What's the problem with just exposing the api
and requiring users who need it to use the streaming parser ?

Personally, I would have cached these details as a properties of the
_ElementInterface implementation for precisely this use case.

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nosy: +robinbryce
status: pending -> open

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