How are you invoking ghci? If it's a stack project you can try stack ghci
if you haven't already.
On Fri, 4 Jun 2021 at 21:51, Galaxy Being
I go to a directory. I run
stack install Safe
I start up ghci and get the Prelude prompt. I run
import Safe
and I get
import Safe | ^^^^^^^^^^^ Failed, no modules loaded.
I'm once again frustrated. I try to load this hs file
{-# LANGUAGE ViewPatterns #-} {-# LANGUAGE NoMonomorphismRestriction #-}
import Safe
lookupDefault :: Eq a => a -> b -> [(a,b)] -> b lookupDefault k _ (lookup k -> Just s) = s lookupDefault _ d _ = d
headTup :: (a, [t]) -> [t] headTup (headMay . snd -> Just n) = [n] headTup _ = []
headNil :: [a] -> [a] headNil (headMay -> Just x) = [x] headNil _ = []
with the same result. What do I need to do? -- ⨽ Lawrence Bottorff Grand Marais, MN, USA borgauf@gmail.com _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners