Achieve instance parity for Cayley and Tannen

ekmett / profunctors

Haskell 98 Profunctors

http://hackage.haskell.org/package/profunctors

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Achieve instance parity for Cayley and Tannen #84

Closed RyanGlScott closed 4 years ago

RyanGlScott commented 4 years ago

This fixes #83 by adding Mapping and Traversing instances for Tannen (which Cayley already has), and by adding Cochoice and Costrong instances for Cayley (which Tannen already has).