these

An either-or-both data type, with corresponding hybrid error/writer monad transformer.

https://github.com/isomorphism/these

Version on this page:	0.6.0.0@rev:5
LTS Haskell 24.56:	1.2.1@rev:3
Stackage Nightly 2026-08-24:	1.2.1@rev:3
Latest on Hackage:	1.2.1@rev:3

See all snapshots these appears in

BSD-3-Clause licensed by C. McCann

Maintained by [email protected]

This version can be pinned in stack with:these-0.6.0.0@sha256:3f345cbcd34fcfbdc4f6f2df7adfbdfc3628b2952a8dc1745384b795cd658f5a,1886

Module documentation for 0.6.0.0

Control
- Control.Monad
  - Control.Monad.Chronicle
    - Control.Monad.Chronicle.Class
  - Control.Monad.Trans
    - Control.Monad.Trans.Chronicle
Data
- Data.Align
- Data.These

Depends on 9 packages(full list with versions):

base, bifunctors, containers, mtl, profunctors, semigroupoids, semigroups, transformers, vector