Weird error during derive-2.3.0.2 build?

I would consider reporting a bug or asking on the haskell-cafe@haskell. Org adress. This is supposed to be a misstake.

You can probably also try to install one of the older versions from Hackage.

I get the same error building derive-2.3.0.2 (also while trying to install Yi). As with you, adding the TypeSynonymInstances language extension only made things worse. While I agree this should be considered a bug, it is not a problem in derive-2.4.1, which is the latest version on Hackage.

If you have that installed, you can build Yi by downloading the package source and changing the derive dependency constraint accordingly. Yi then builds/runs for me, but I can only imagine there might have been an underlying reason for the original constraint (derive Good Luck!

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