[web-devel] Call for comments: Yesod 0.2

[Michael Snoyman]

Unfortunately, it really does require 6.12. The issue is that we need to
automatically generate a type instance for "Routes". While 6.10 supports
type instances, it doesn't include that support in the template haskell.

If people are interested, I think it would be possible to make the Routes
type instance dependent upon the template-haskell version number, and then
users would need to declare it themselves.

By the way, I actually just released web-routes-quasi 0.3.0.

Michael

On Sun, May 23, 2010 at 12:44 AM, Arie Peterson <ariep at xs4all.nl> wrote:

> On Sat, 22 May 2010 20:42:51 +0300, Michael Snoyman <michael at snoyman.com>
> wrote:
> > [...]
> >
> > Note: right now it depends on web-routes-quasi 0.3.0, which has not yet
> > been
> > released, so you'll have to pull that from the github repo.
>
> In order to test my proposed solution (see below), I tried building
> web-routes-quasi 0.3.0 from git, but I get another cabal version conflict
> failure:
>
> | Resolving dependencies...
> | cabal: cannot configure template-haskell-2.4.0.1. It requires base >=4.2
> && <5
> | For the dependency on base >=4.2 && <5 there are these packages:
> base-4.2.0.0
> | and base-4.2.0.1. However none of them are available.
> | base-4.2.0.0 was excluded because of the top level dependency base -any
> | base-4.2.0.1 was excluded because of the top level dependency base -any
>
> I assume this means that it needs ghc 6.12 (which I haven't installed
> yet). Do you really need template-haskell-2.4.*, or would 2.3.* suffice as
> well? In that case you could relax the version constraint.
>
> > On Sat, May 22, 2010 at 7:32 AM, James Britt <james at neurogami.com>
> wrote:
> >
> >> james at james06:~/data/vendor/yesod$ runhaskell Setup.lhs configure
> --user
> >> Configuring yesod-0.2.0...
> >> Warning: This package indirectly depends on multiple versions of the
> same
> >> package. This is highly likely to cause a compile failure.
> >> package http-wget-0.6.2 requires transformers-0.1.4.0
> >> package control-monad-attempt-0.3.0 requires transformers-0.1.4.0
> >> package authenticate-0.6.2 requires transformers-0.1.4.0
> >> package yesod-0.2.0 requires transformers-0.2.1.0
> >> package MonadCatchIO-transformers-0.2.2.0 requires transformers-0.2.1.0
> >>
> >> [...]
> >>
> >> Suggestions?
>
> >From a quick look at the source of yesod, it /seems/ that it may work with
> MonadCatchIO-transformers-0.1.* as well. Is there any reason yesod asks for
> >=0.2.2 ? If not, relaxing this version constraint might fix things.
>
>
> Regards,
>
> Arie
>
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