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74358c188a
Fixes #123. The code assumes that every File that has its link_target() method called would first have been checked to make sure it’s actually a link first. Unfortunately it also assumed that the only thing that can go wrong while following a link is if the file wasn’t a link, meaning it crashes when given a link it doesn’t have permission to follow. This makes the file_target() method able to return either a file or path for displaying, as before, but also an IO error for when things go wrong.
Extra tests
These extra tests are intended to be run from a Vagrant VM that has already had its environment set up -- see the section in the README for more details.