[Haskell-cafe] Re: Basic question....

"Chaddaï Fouché" writes:

Not only does you lack some parens around your patterns, your function types are wrong :

type Key = String

data EnvItem a = EnvItem (Key, a)

envKey :: EnvItem a -> String envKey (EnvItem (key, value)) = key

envValue :: EnvItem a -> a envValue (EnvItem (key, value)) = value

Why not

data EnvItem a = EnvItem {key:: Key, value:: a}

? -- Jón Fairbairn Jon.Fairbairn@cl.cam.ac.uk