StackOverflow2013

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<blockquote> I'm thinking that perhaps it's useful in some cases as a type-safe way of exhaustively handling "can't happen" cases </blockquote> This is precisely right. You could say that <code>absurd</code> is no more useful than <code>const (error "Impossible")</code>. However, it is type restricted, so that its only input can be something of type <code>Void</code>, a data type which is intentionally left uninhabited. This means that there is no actual value that you can pass to <code>absurd</code>. If you ever end up in a branch of code where the type checker thinks that you have access to something of type <code>Void</code>, then, well, you are in an absurd situation. So you just use <code>absurd</code> to basically mark that this branch of code should never be reached. "Ex falso quodlibet" literally means "from [a] false [proposition], anything follows". So when you find that you are holding a piece of data whose type is <code>Void</code>, you know you have false evidence in your hands. You can therefore fill any hole you want (via <code>absurd</code>), because from a false proposition, anything follows. I wrote a blog post about the ideas behind Conduit which has an example of using <code>absurd</code>. <a href="http://unknownparallel.wordpress.com/2012/07/30/pipes-to-conduits-part-6-leftovers/#running-a-pipeline">http://unknownparallel.wordpress.com/2012/07/30/pipes-to-conduits-part-6-leftovers/#running-a-pipeline</a>
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1. POWhat's the absurd function in Data.Void useful for?
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