bloglang/13/examples/pair.txt

data Pair a b = { MkPair a b }

defn fst p = {
    case p of {
        MkPair a b -> { a }
    }
}

defn snd p = {
    case p of {
        MkPair a b -> { b }
    }
}

defn pair = { MkPair 1 (MkPair 2 3) }

defn main = { fst pair + snd (snd pair) }