one-liner

Constraint-based generics

https://github.com/sjoerdvisscher/one-liner

LTS Haskell 24.28:	2.1.1
Stackage Nightly 2026-01-18:	2.1.1
Latest on Hackage:	2.1.1

See all snapshots one-liner appears in

BSD-3-Clause licensed by Sjoerd Visscher, Xia Li-yao

Maintained by [email protected]

This version can be pinned in stack with:one-liner-2.1.1@sha256:49f3a153002345570abff49c881fae51e379efcf98d1733b11ed8abc07689ed2,1668

Module documentation for 2.1.1

Generics
- Generics.OneLiner
  - Generics.OneLiner.Binary
  - Generics.OneLiner.Classes
  - Generics.OneLiner.Internal
    - Generics.OneLiner.Internal.Unary

Depends on 7 packages(full list with versions):

bifunctors, contravariant, linear-base, profunctors, tagged

Used by 1 package in nightly-2026-01-18(full list with versions):

unfoldable

Write short and concise generic instances of type classes. one-liner is particularly useful for writing default implementations of type class methods.