patch applied (packages/base): add derived instances for Dual monoid

Ross Paterson ross at soi.city.ac.uk
Fri Feb 2 14:18:21 EST 2007


Fri Feb  2 11:08:47 PST 2007  Ross Paterson <ross at soi.city.ac.uk>
  * add derived instances for Dual monoid

    M ./Data/Monoid.hs +1


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