metaperl wrote:
>
> I dont understand what the "L" means below. I'm guessing it is a type
> constructor for CludsVertVisibility which takes one argument... Just like
> "SkyClear" is a nullary type constructor.
>
>
Yeah, that's clearly what it is. If you look at the instance code you see
pattern matching based on that very same "L" and SkyClear:
instance report CloudsVertVisibility
where report SkyClear = ">05000"
report (L cs) = case getCeilings cs of
[] -> ">05000"
cs # visibility = minList cs
-> " " +++ toDigits visibility 5
--
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