On Thu, 22 Nov 2012, Simon Peyton-Jones wrote:

The solution is obvious: we should make it possible to instally 
yesod-platform-2.7 twice,
 once version depending on data-default-0.4
 once version depending on data-default-0.5.

Does ghc-pkg allow to have two different versions of yesod-platform-2.7 being installed?

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