Created
February 12, 2017 15:17
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Typeclasses in the REPL.
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| 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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