GHC 8.4.1-alpha1 was <a href="https://mail.haskell.org/pipermail/ghc-devs/2017-Decembe

I still got the errror in 0.9.1: <div class="snippet-clipboard-content notranslate

Build error with GHC 8.4.1-alpha1 about fmlist HOT 3 CLOSED

sjoerdvisscher commented on September 18, 2024

Build error with GHC 8.4.1-alpha1

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Comments (3)

asr commented on September 18, 2024

For knowing the warnings in GHC 8.0.2/8.2.2, I realised it's better to use the -Wcompat flag:

$ cabal install --force-reinstalls --ghc-options='-Wcompat -Werror'

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sjoerdvisscher commented on September 18, 2024

Fixed in 0.9.1!

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asr commented on September 18, 2024

I still got the errror in 0.9.1:

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.4.0.20171214

$ cabal get fmlist
$ cd fmlist-0.9.1
$ cabal sandbox init
$ cabal install
1 of 1] Compiling Data.FMList      ( Data/FMList.hs, dist/dist-sandbox-5174637b/build/Data/FMList.o )

Data/FMList.hs:302:10: error:
    • No instance for (Semigroup.Semigroup (FMList a))
        arising from the superclasses of an instance declaration
    • In the instance declaration for ‘Monoid (FMList a)’
    |
302 | instance Monoid (FMList a) where
    |          ^^^^^^^^^^^^^^^^^
Failed to install fmlist-0.9.1

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