[Haskell-cafe] Errors in non-monadic code

[Brandon Allbery]

On Mon, Aug 19, 2013 at 2:59 PM, <jabolopes at google.com> wrote:

> I'd say that if you were in the context of the IO monad, maybe you'd
> prefer to use exceptions instead of 'Either' or 'Maybe'.
>

Even in IO, exceptions should be reserved for truly exceptional conditions
(of the "program cannot safely continue" variety), not merely for error
checking when this can be described as a normal flow of evaluation.
Exceptions are not simply alternative flow of control, even in procedural
languages; they are *disruptions* of flow of control.

-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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