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GHC 9.10.3 · lts/ghc-9.10.x · 248f8f0 · 2026-10-05

Modulenatural-transformation-0.4Haskell2010

Control.Natural.RULES

GHC RULE for Natural Transformation

  RULES "natural free theorem" [~]
     forall h (r :: (Functor f, Functor g, Transformation f g t) => t) .
       fmap h . (r #) = (r #) . fmap h