Error reporting does not work when line numbers are reported as -1

[chipkent]

I'm attempting to test error reporting. When I get the -1 line number in the error, error reporting does not work. Since I always get the error, I can't test error reporting in any way.

See #9

[bmingles]

This is a side effect of the underlying bug impacting #9. There's not really anything we can do to match the line numbers if the underlying Python doesn't provide it. Going to close this as a duplicate. If / when we resolve the line number problem, this should go away.