undefined error when calling insert on GHC 7.6.1

[Jasper Van der Jeugt]

I'm using:

ghc-7.6.1
array-0.4.0.1
deepseq-1.3.0.1
containers-0.5.0.0
lrucache-1.1.1.1

When I execute the file:

import qualified Data.Cache.LRU.IO as Lru

main :: IO ()
main = do
    lru <- Lru.newAtomicLRU (Just 10)

    _ <- Lru.lookup "foo" lru
    _ <- Lru.lookup "bar" lru

    Lru.insert "bar" "hi" lru
    Lru.insert "foo" "hi" lru

I get

Prelude.undefined

This is quite serious since it is affecting all hakyll users on GHC 7.6.1.

@A1kmm If you have some time, could you try to reproduce this, since you also appear to be using lrucache on ghc-7.6.1 (#6).

[chowells79]

Thanks for the report. Looking into this...

[chowells79]

Ok, looks like this is the result of a change to containers. That's annoying..

[chowells79]

Fix in version 1.1.1.2, now on hackage.