add Foldable and Traversable instances for Either a and (,) a
authorRoss Paterson <ross@soi.city.ac.uk>
Fri, 31 May 2013 01:25:57 +0000 (02:25 +0100)
committerRoss Paterson <ross@soi.city.ac.uk>
Fri, 31 May 2013 01:25:57 +0000 (02:25 +0100)
commitcb2f2d42b9d8b2109bc141ad8d63fb2fcbd8a926
treefe249a25b9f41abe92b67f0d78558ff545685542
parent3730af094ef83715243bad5a13a45de22f6ed8df
add Foldable and Traversable instances for Either a and (,) a

Agreed in January 2011, but not implemented:

http://thread.gmane.org/gmane.comp.lang.haskell.libraries/15196
http://thread.gmane.org/gmane.comp.lang.haskell.libraries/17686
http://thread.gmane.org/gmane.comp.lang.haskell.libraries/19594
libraries/base/Data/Foldable.hs
libraries/base/Data/Traversable.hs