PVP proposal: no upper bounds on non-upgradeable packages

[Johan Tibell]

On Wed, Apr 9, 2014 at 10:08 PM, Erik Hesselink <hesselink at gmail.com> wrote:

> The only constraint that actually makes sense for template-haskell is
> 'installed', which I have in my cabal.config. I think this should
> perhaps be built into cabal. This can then be combined with a
> constraint on the known versions of TH a package works with.
>

Adding "installed" to the user supplied constraints for base,
template-haskell, and ghc-prim sounds sensible.
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