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warning about GHC 7.4 and happstack-state
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Jeremy Shaw  
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 More options Jan 31, 6:08 pm
From: Jeremy Shaw <jer...@n-heptane.com>
Date: Tue, 31 Jan 2012 17:08:37 -0600
Local: Tues, Jan 31 2012 6:08 pm
Subject: warning about GHC 7.4 and happstack-state
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Just a heads up!

happstack-state compiles and works with GHC 7.4. HOWEVER, it does not
correctly read old checkpoint files.

The reason is because the names generated by the typeable instance are no
longer fully qualified.

When compiling apps I get a warning:

  Warning: In the use of `mkTyCon'
(imported from Happstack.Data, but defined in Data.Typeable):
Deprecated: "either derive Typeable, or use mkTyCon3 instead"

I think that if we conditionally use mkTyCon3 when available that might
provide backwards compatibility.

If someone wants to make a patch there is a bug:

http://code.google.com/p/happstack/issues/detail?id=164&thanks=164&ts...

On the other hand, maybe this is the kick in the pants you need to switch
to acid-state. The migration guide for that is here:

http://code.google.com/p/happstack/wiki/HapstackStateToAcidState

- jeremy


 
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