Upgrade of Haskell Platform

[Mark Lentczner]

No, this isn't possible: If you move to a new version of GHC, then you need
to recompile all libraries you use.

Typically, people just use new version time as housecleaning: You just blow
away your entire install and all libs you installed while using it, and then
just cabal install libraries as your projects need them.

Running these commands is useful:

cabal update *do this one to update the DB from hackage*


Then for each project:

cd myHaskellProject
cabal configure
cabal install --only-dependencies


- Mark
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