[Haskell-cafe] Fwd: The Typeable class is changing

[Alberto G. Corona]

What to do when the data has been defined in other package and provides no
Typeable instance?


2011/7/11 Yitzchak Gale <gale at sefer.org>

> Simon Marlow has announced[1] on the Haskell Libraries
> list that the Typeable class is changing.
>
> The standard way to create a Typeable instance is
> just to derive it. If you do that, you will not be affected
> by this change.
>
> But it seems that many packages create Typeable
> instances by explicitly using mkTyCon. If your package
> does this, it will eventually break, after a deprecation
> period.
>
> Please respond to this thread if you own a package
> that will be affected by this change.
>
> Can someone who has quick access to the entire contents
> of Hackage please do a grep and find out exactly which
> packages on Hackage will be affected? Thanks.
>
> -Yitz
>
> [1] http://www.haskell.org/pipermail/libraries/2011-July/016546.html
>
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