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Fix Trac #4220
author
simonpj@microsoft.com
<unknown>
Thu, 12 Aug 2010 13:13:19 +0000
(13:13 +0000)
committer
simonpj@microsoft.com
<unknown>
Thu, 12 Aug 2010 13:13:19 +0000
(13:13 +0000)
For deriving Functor, Foldable, Traversable with empty
data cons I just generate a null equation
f _ = error "urk"
There are probably more lurking (eg Enum) but this will do for now.
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