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deech/typeclass-repl.hs

Created February 12, 2017 15:17
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Typeclasses in the REPL.
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typeclass-repl.hs
GHCi, version 8.0.1: http://www.haskell.org/ghc/ :? for help
Loaded GHCi configuration from /tmp/ghci7261/ghci-script
Prelude> class Foo a where { foo :: a -> Int }
Prelude> instance Foo () where { foo _ = 1 }
Prelude> f = foo ()
Prelude> class Foo a where { foo :: a -> IO () }
Prelude> f
1
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