fix issue 463

[marcoieni]

Fix #463
Ugly, but it works. I am sure there is a better solution, so if you can find it, great!

[dandavison]

@marcoieni can you explain why this fixes the problem?

[marcoieni]

Not really! 😅
I just noticed that if output_type.handle().unwrap(), i.e. writer is passed as function argument it doesn't work. I think it has to do with lifetimes, but the rust compiler doesn't complain.
I think that a better fix would be to edit the handle function.

[dandavison]

I think I (eventually!) found a cleaner solution: #469

[dandavison]

Thanks very much @marcoieni for locating the bug and pointing out that the fix was to stop that writer getting destroyed too early.