How to use List.find?

[abhin4v]

Using List.find throws Zonk error:

hell: Zonk error: Ambiguous meta variable.
CallStack (from HasCallStack):
  error, called at src/Hell.hs:135:35 in main:Main

Here is a test program:

main = do
  let x = List.find (\a -> Text.eq a "x") ["x", "y"]
  Monad.return ()

I suspect this is because of the b type variables in its signature:

List.find :: forall a b . (a -> Bool) -> [a] -> Maybe a

[chrisdone]

Good catch! Thank you for letting me know! I should probably have a test suite make sure all polymorphic names are exercised.

That’s an easy fix; just drop b from the sig in Hell.hs and it’ll work. Feel free to open a PR, else I’ll fix this when I’m back at keyboard, which might not be until Tuesday. On vacation at the moment.

[chrisdone]

I got a brief minute at keyboard, so I pushed the fix to drop the b variable to master at befd15d.