feat: Recover from errors with move semantics #44
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This is an experiment on how to recover from errors using move semantics. This adds an additional (generic) field to
Exn<E, R>which we can move out usingexn.recover(). By default we have no recovery value so all previous uses ofExnare unchanged.I also added an example to show how one would use this recovery mechanism.
This PR is only intended as a reference for issue #43. There may be better approaches on how to achieve this goal.