On 17 April 2013 18:10, Johannes Waldmann
Is it still the case that "It just doesn't work to have multiple versions of a wired-in package" (cf. http://hackage.haskell.org/trac/ghc/ticket/5704 )?
ghc-7.6.2 comes with containers-0.5.0.0 and template-haskell-2.8.0.0 . It seems I can upgrade to containers-0.5.2.1 and use it with no problems but not alongside template-haskell:
template-haskell depends upon containers; as such, if you try and use a different version of containers whilst also using template-haskell you're going to run into the diamond dependency problem: http://www.well-typed.com/blog/9#
... changes: containers-0.5.0.0 -> 0.5.2.1, Warning: The following packages are likely to be broken by the reinstalls: ... ghc-7.6.2
(Isn't it somewhat bold of cabal-install to offer to break "ghc-7.6.2"? like, this will completely hose the compiler?)
That's bad, because I use containers everywhere, and I assume that 0.5.2.1 has some advantages (like, speed) over 0.5.0.0.
- J.W.
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