singleton-bool

Type level booleans

https://github.com/phadej/singleton-bool#readme

LTS Haskell 24.28:0.1.8@rev:1
Stackage Nightly 2026-01-14:0.1.8@rev:1
Latest on Hackage:0.1.8@rev:1

See all snapshots singleton-bool appears in

BSD-3-Clause licensed and maintained by Oleg Grenrus
This version can be pinned in stack with:singleton-bool-0.1.8@sha256:f2863c5109fae42d4df03b1e3270aac4e3336e725e0cbe9663e8ccfc515a6ec1,1244

Module documentation for 0.1.8

Depends on 5 packages(full list with versions):
base, boring, dec, deepseq, some
Used by 2 packages in nightly-2026-01-14(full list with versions):
cabal-plan, servant

Type level booleans.

singletons package provides similar functionality, but it has tight dependency constraints.

Changes

  • 0.1.8

    • Support GHC-8.6.5…9.10.1

  • 0.1.7

    • Add EqP and OrdP instances

  • 0.1.6

    • Add boring instances
    • Add some (GEq etc) instances
    • Add deepseq instances
    • Require GHC-7.8+

  • 0.1.5

    • Add discreteBool :: Dec (a :~: b) (GHC-7.8+)
    • Add Show, Eq, Ord SBool b instances.

  • 0.1.4

    • Add fromSBool and withSomeSBool.

  • 0.1.3.0

    • Add reifyBool and reflectBool.
    • Drop GHC-7.4 support (broken PolyKinds)

  • 0.1.2.0

    • Enable PolyKinds on GHC >= 7.6
    • Add sboolEqRefl :: SBoolI (a == b) => Maybe (a :~: b)

  • 0.1.1.0

    • Add eqToRefl, eqCast, trivialRefl