[Haskell-cafe] version of containers fixed by template-haskell?

Ivan Lazar Miljenovic ivan.miljenovic at gmail.com
Wed Apr 17 10:15:35 CEST 2013

On 17 April 2013 18:10, Johannes Waldmann <waldmann at imn.htwk-leipzig.de> wrote:
> 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- and template-haskell- .
> It seems I can upgrade to containers- 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:

> ... changes: containers- ->,
> 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
> has some advantages (like, speed) over
> - J.W.
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Ivan Lazar Miljenovic
Ivan.Miljenovic at gmail.com

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