swap and assoc: Symmetric and Semigroupy Bifunctors; documentation

 Provides generalisations of
 .
 swap :: (a,b) -> (b,a) and
 .
 assoc :: ((a,b),c) -> (a,(b,c))
 .
 to
 Bifunctors supporting similar operations (e.g. Either, These).
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.