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

[Roman Cheplyaka]

* Herbert Valerio Riedel <hvr at gnu.org> [2013-12-16 10:53:21+0100]
> Why not simply use the existing `fail :: String -> IO a` method instead?

The purpose of 'fail' is to handle monadic pattern-match failures.
I consider explicit use of 'fail' in user code a hack.

Roman
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