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ndmitchell avatar ndmitchell commented on April 27, 2024

Sorry it's taken a little while to get to this, especially as it's a regression. My computer suddenly died about the time you reported this error, and I'm only really now back up and running properly. A minimal example, avoiding Lamdu, is:

import Data.Derive.Monoid
import Data.DeriveTH
import Data.Monoid

data Foo a b = Foo (a b)

data Scope name m = Scope
  { _scopeLocals    :: [Foo m name]
  , _scopeGlobals   :: [Foo m name]
  }

derive makeMonoid ''Scope

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ndmitchell avatar ndmitchell commented on April 27, 2024

The issue was that in GHC 7.8 and below, the only type variables that got kind annotations were those which weren't kind *, and due to accidental luck, I stripped those from contexts. In GHC 7.10 all variables got kind annotations, so I stripped them all on all versions, and that broke the example above as m is kind * -> *. I fixed that by slightly more intelligent handling of kind annotations, treating no annotation and an annotation of * as equivalent. I've just released derive-2.5.20 with the fix.

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