Given two different types T1 and T2, it's possible to have two
different results of
> let {x :: T1; x = read s} in show x
and
> let {x :: T2; x = read s} in show x
so that neither of two "read"s fails. For example
> let {x :: Int; x = read "1000000000000"} in show x
produces the answer "-727379968".
BTW, I'd love to be able to give default instances locally, so that
something like
> main = withdef Read Int {putStrLn $ show $ read "1000000000000"}
would typecheck successfully.
On 7 Dec 2008, at 16:11, John Ky wrote:
Hi,
Is there a way to read Showables?
main = do
putStrLn $ show $ read
Thanks
-John
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