Proposal: die to System.Exit (and/or Prelude)

[Roman Cheplyaka]

* Vo Minh Thu <noteed at gmail.com> [2013-12-14 12:09:20+0100]
> Isn't your `die` function a special case of `error :: String -> a`,
> which is in the Prelude ?

There are two differences:

* die throws an exception in the IO monad (i.e. it uses `throwIO`,
  whereas `error` uses `throw`).
* error adds "*** Exception: " to the message

Roman
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