On Wed, Apr 13, 2016 at 05:12:32PM +0530, Rustom Mody wrote:
I tried the examples here:
https://mrkkrp.github.io/megaparsec/tutorials/fun-with-the-recovery-feature....
Got a page full of errors starting:
fpl.hs:42:20: Not in scope: ‘<$>’ … Perhaps you meant one of these:
On a hunch I changed import Control.Applicative (empty) to import Control.Applicative
and then it started working. I can only expect that if megaparsec's own official tutorials are thus out of sync with current haskell, then parsec's will be even more so.
On the contrary, you are out of sync with current Haskell :) <$> is in the latest Prelude. Still, best practices should mandate that tutorials support earlier releases of Haskell too, to avoid these types of confusion.
Also I find no megaparsec on hoogle/hayoo
I recommend the Hoogle provided by Stackage. It searches more packages by default, including megaparsec. https://www.stackage.org/ (Alternatively, I think there is a magic incantation to make the haskell.org Hoogle search more packages, but I don't know it). Tom