permutation Applicative and Monad with many mtl instances https://github.com/sonyandy/perm
|Latest on Hackage:||0.4.0.0|
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Based on "Parsing Permutation Phrases", by Arthur Baars, Andres Loeh and S.
Doaitse Swierstra, Haskell Workshop 2001. The implementation given here
does not include explicit optional actions, and instead implements
be used where
would be used.
addOpt m a n