Re: [Haskell-cafe] How to fix ambiguous type variable?

Hi everyone! Thank you for your quick and (as always) helpful responses! -------------------------------------------------------------------------------- Sandeep, > This seems to work for me... > > someCheck :: forall a . (Show a, Read a, Eq a) => String -> a -> Bool > > someCheck s v = (read . show . (read :: String -> a) $ s) == v > > Probably requires 'ScopedTypeVariables'... I clearly tried using `forall a`, but without `ScopedTypeVariables`. That's the missing thing. Thank you very much! -------------------------------------------------------------------------------- Viktor, thank you for providing even more options! I was looking for something like `TypeApplications`! -------------------------------------------------------------------------------- Marian, Agree, a good point. And actually, your variant works without any extensions. Cheers, boris@d12frosted.io ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Thursday, June 13, 2019 8:45 AM, Sandeep.C.R via Haskell-Cafe wrote: > This seems to work for me... > > someCheck :: forall a . (Show a, Read a, Eq a) => String -> a -> Bool > > someCheck s v = (read . show . (read :: String -> a) $ s) == v > > Probably requires 'ScopedTypeVariables'... > > On 13/06/19 11:06 AM, Boris wrote: > > > someCheck :: (Show a, Read a, Eq a) => String -> a -> Bool > > someCheck s v = (read . show . read $ s) == v > > Haskell-Cafe mailing list > To (un)subscribe, modify options or view archives go to: > http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe > Only members subscribed via the mailman list are allowed to post.