Argument Clinic: negative line numbers

[serhiy-storchaka]

BPO	20143
Nosy	@larryhastings, @serhiy-storchaka

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = 'https://github.com/larryhastings' closed_at = created_at = labels = ['type-bug'] title = 'Argument Clinic: negative line numbers' updated_at = user = 'https://github.com/serhiy-storchaka' ``` bugs.python.org fields: ```python activity = actor = 'larry' assignee = 'larry' closed = True closed_date = closer = 'larry' components = [] creation = creator = 'serhiy.storchaka' dependencies = [] files = [] hgrepos = [] issue_num = 20143 keywords = [] message_count = 4.0 messages = ['207434', '207468', '207469', '207470'] nosy_count = 3.0 nosy_names = ['larry', 'python-dev', 'serhiy.storchaka'] pr_nums = [] priority = 'normal' resolution = 'fixed' stage = 'resolved' status = 'closed' superseder = None type = 'behavior' url = 'https://bugs.python.org/issue20143' versions = ['Python 3.4'] ```

[serhiy-storchaka]

In case of error Argument Clinic sometimes reports negative line numbers.

[larryhastings]

I've seen the problem before, but was too busy to fix it. Give me a reproducable test case and I'll fix it.

[1762cc99-3127-4a62-9baf-30c3d0f51ef7]

New changeset 9c8d31d69044 by Larry Hastings in branch 'default': Issue bpo-20143: The line numbers reported in Argument Clinic errors are http://hg.python.org/cpython/rev/9c8d31d69044

[larryhastings]

Oh, golly, this was one of those "what was I thinking?" sorts of bugs. The problem (and the fix) was obvious once I stared at it long enough.