Why upper bound version numbers?

Brandon Allbery allbery.b at gmail.com
Mon Jun 6 21:13:11 UTC 2016

On Mon, Jun 6, 2016 at 5:02 PM, Dominick Samperi <djsamperi at gmail.com>

> Consequently, it refuses to install with the latest ghc provided with
> the Haskell Platform (8.0.1).

base is not defined by the Platform, it is defined by (and ships with, and
must completely match) ghc.
And no, backward compatibility is not guaranteed; for a recent example, ghc
7.10 broke many programs by making Applicative a "superclass" of Monad and
by generalizing many Prelude functions to Foldable and/or Traversable.

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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