Fix unhandled errors #97
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#89 spotted un unhandled error. The error path should be pretty unlikely which is why I guess this was uncaught until now, but it's a pretty ugly bug nonetheless, so I've added some extra linters to our CI.
The
ineffassignlinter catches this prior to fixing (as well as one additional case), and I also addederrcheck(which caught an additional two), andunusedis unrelated but I added it as it seems like a nice and uncontroversial check to have.