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Since Filterable has instances for all the polynomial functors except Par1/Identity it can be given a Generically1 f instance. It was added in base-4.17.0.0, for earlier versions you can use the generically package.
Since
Filterable
has instances for all the polynomial functors exceptPar1
/Identity
it can be given aGenerically1 f
instance. It was added in base-4.17.0.0, for earlier versions you can use the generically package.This allows deriving
Filterable
for generic typesThe same can be done for
Witherable
but only once there is aTraversable (Generically1 t)
instance.This can wait since neither
Traversable
norWitherable
are coerce-derivable at the moment but I am working on allowing them to be derived.The text was updated successfully, but these errors were encountered: