[Haskell-cafe] The Typeable class is changing

Yitzchak Gale gale at sefer.org
Mon Jul 11 20:18:30 CEST 2011

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

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.


[1] http://www.haskell.org/pipermail/libraries/2011-July/016546.html

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