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generic-deriving v1.12 Release Notes

Release Date: 2017-12-07 // over 6 years ago
    • Adapt to the EmptyDataDeriving proposal (introduced in GHC 8.4):
      • Generics.Deriving.TH now derives to(1) and from(1) implementations for empty data types that are strict in the argument.
      • Introduce an EmptyCaseOptions field to Options in Generics.Deriving.TH, which controls whether generated from(1)/to(1) implementations for empty data types should use the EmptyCase extension or not (as is the case in GHC 8.4).
      • Add mkFrom0Options, mkFrom1Options, mkTo0Options, and mkTo1Options functions to Generics.Deriving.TH, which take EmptyCaseOptions as arguments.
      • The backported instances for V1 are now maximally lazy, as per EmptyDataDeriving. (Previously, some instances would unnecessarily force their argument, such as the Eq and Ord instances.)
      • Add instances for V1 in Generics.Deriving.Copoint, .Eq, .Foldable, .Functor, .Show, and .Traversable.
    • ✂ Remove the bitrotting simplInstance function from Generics.Deriving.TH.