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Define a function to promote F-algebras into R-algebras.

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Rob Rix 2017-04-24 15:45:50 -04:00
parent 953034ccb3
commit d6cb7890b9
1 changed files with 2 additions and 0 deletions
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src/Language/Ruby/Syntax.hs
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@ -115,6 +115,8 @@ type FAlgebra t a = Base t a -> a
-- | An R-algebra on the base functor of some type 't'.
type RAlgebra t a = Base t (t, a) -> a
fToR :: Functor (Base t) => FAlgebra t a -> RAlgebra t a
fToR f = f . fmap snd
-- | Produce a list of identifiable subterms of a given term.
--