> Sorry,
>
> I've just worked it out.
>
> PortNumber is an instance of the class Enum
> so we can use
>
> toEnum :: Int -> a
It's also an instance of the Integral class, which means you can just
write integral constants of type PortNumber. eg. (80 :: PortNumber) is
valid. Also, the universal integral conversion function 'fromIntegral'
can be used for converting values of other integral types into
PortNumbers (this is preferable to toEnum).
Cheers,
Simon
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