[Haskell-beginners] How do I use Guards in record syntax?

[Kim-Ee Yeoh]

On Mon, Apr 14, 2014 at 1:03 PM, Dimitri DeFigueiredo <
defigueiredo at ucdavis.edu> wrote:

>     oldbuysell :: String  -- "buy", "sell" or ""


Why is this String when you've defined the perfectly cromulent BuyOrSell
datatype?

How can you be sure there won't be some accidental buggy code that sets the
field to "buyy"?

-- Kim-Ee
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