[Haskell-cafe] portable arrow instances

[Don Stewart]

Could you add this info/link to the upgrading page?

    http://www.haskell.org/haskellwiki/Upgrading_packages#Arrow_instances>,

Using social/community processes to parallelise the job of finding all
the upgrade routes -- I like it :-)

-- Don


conal:
>    Hi Wolfgang,
> 
>    I use CPP to manage such differences between 6.8, 6.9, and 6.10.  As an
>    example, see
>    [1]http://hackage.haskell.org/packages/archive/TypeCompose/latest/doc/html/src/Control-Compose.html
>    .
> 
>    Regards, - Conal
> 
>    On Tue, Nov 18, 2008 at 6:01 AM, Wolfgang Jeltsch
>    <[2]g9ks157k at acme.softbase.org> wrote:
> 
>      Hello,
> 
>      how do I make a library work with both GHC 6.8 and GHC 6.10?  According
>      to
>      <[3]http://www.haskell.org/haskellwiki/Upgrading_packages#Arrow_instances>,
>      I
>      should change all my Arrow instances but then they don't work with GHC
>      6.8
>      anymore, do they?  Or is the solution to force GHC 6.8 users to use
>      base-4.0.0.0?
> 
>      Best wishes,
>      Wolfgang
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> 
> References
> 
>    Visible links
>    1. http://hackage.haskell.org/packages/archive/TypeCompose/latest/doc/html/src/Control-Compose.html
>    2. mailto:g9ks157k at acme.softbase.org
>    3. http://www.haskell.org/haskellwiki/Upgrading_packages#Arrow_instances
>    4. mailto:Haskell-Cafe at haskell.org
>    5. http://www.haskell.org/mailman/listinfo/haskell-cafe

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