This library provides eliminators for inductive data types, leveraging the power of the singletons library to allow dependently typed elimination.

Changes

0.9.3 [2023.03.12]

Require singletons-base-3.2 and GHC 9.6.

0.9.2 [2023.02.27]

Support building with th-abstraction-0.5.*.

0.9.1 [2022.08.23]

Require GHC 9.4.

Add Data.Eliminator.TypeLits, which re-exports
Data.Eliminator.TypeNats.elimNat and adds a new elimSymbol eliminator
for GHC.TypeLits.Symbol.

0.9 [2021.10.31]

Require singletons-base-3.1 and GHC 9.2.

Add {e,E}limProxy to Data.Eliminator.

Data.Eliminator no longer exports {e,E}limFirst and {e,E}limLast
eliminators. If you wish to use eliminators that work over First/Last
from Data.Monoid, you must import them Data.Eliminator.Monoid. If you
wish to use eliminators that over First/Last from Data.Semigroup, you
must import them from the new Data.Eliminator.Semigroup module.

Data.Eliminator no longer exports {e,E}limProduct and {e,E}limSum
eliminators. If you wish to use eliminators that work over Product/Sum
from Data.Monoid or Data.Semigroup, you must import them
Data.Eliminator.Monoid or Data.Eliminator.Semigroup. If you wish to use
eliminators that over Product/Sum from
Data.Functor.Product/Data.Functor.Sum, you must import them from the new
Data.Eliminator.Functor module.

0.8 [2021.03.12]

Require singletons-base-3.0 and GHC 9.0.

Remove eliminators for Data.Semigroup.Option, which is deprecated as of
base-4.15.0.0.

0.7 [2020.03.25]

Require singletons-2.7 and GHC 8.10.

Add experimental support for generating type-level eliminators through the
deriveTypeElim and deriveTypeElimNamed functions.

Add eliminators for All, Any, Arg, Const, Down, Dual, First,
Identity, Last, Max, Min, Option, Product, Sum,
and WrappedMonoid.

0.6 [2019.08.27]

Require singletons-2.6 and GHC 8.8.

0.5.1 [2019.04.26]

Support th-abstraction-0.3.0.0 or later.

0.5 [2018.09.18]

Require singletons-2.5 and GHC 8.6.

0.4.1 [2018.02.13]

Add elimVoid to Data.Eliminator.

0.4 [2018.01.09]

Require singletons-2.4 and GHC 8.4.

0.3 [2017-11-07]

Migrate the old elimNat from Data.Eliminator (which worked over the Nat
from GHC.TypeNats) to Data.Eliminator.TypeNats. There elimNat that now
lives in Data.Eliminator is for an unrelated Nat data type from the
singleton-nats package (which is a proper, inductively defined, Peano
natural number type).

0.2 [2017-07-22]

Introduce the Data.Eliminator.TH module, which provides functionality for
generating eliminator functions using Template Haskell. Currently, only
simple algebraic data types that do not use polymorphic recursion are
supported.