[Haskell-cafe] breaking too long lines

Luke Palmer lrpalmer at gmail.com
Wed Apr 22 15:03:41 EDT 2009

On Mon, Apr 20, 2009 at 8:44 AM, Tillmann Rendel <rendel at cs.au.dk> wrote:

> However, I would prefer the following Coq-like syntax:
>  data Maybe a =
>    | Just a
>    | Nothing

Of course, Coq's inductive syntax is just GADT form:

Inductive Maybe a :=
| Just : a -> Maybe a
| Nothing : Maybe a.

data Maybe a where
    Just :: a -> Maybe a
    Nothing :: Maybe a

I find GADT syntax much clearer than H98 syntax, so I use it when I'm not
being picky about compatibility.  :-)

(And yes, I know you just meant the optional leading bar)

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