Cookbook/Compilers and interpreters

GHC

TODO

GHCi

Problem

Solution

Examples

checking definitions

:i

Prelude> :i Monad
class Monad m where
  (>>=) :: m a -> (a -> m b) -> m b
  (>>) :: m a -> m b -> m b
  return :: a -> m a
  fail :: String -> m a
        -- Defined in GHC.Base
instance Monad Maybe -- Defined in Data.Maybe
instance Monad IO -- Defined in GHC.IOBase
instance Monad ((->) r) -- Defined in Control.Monad.Instances
instance Monad [] -- Defined in GHC.Base

checking types

:t

Prelude> :t "Hello"
"Hello" :: [Char]

Prelude> :t length
length :: [a] -> Int

Hugs

TODO