some

Existential type: Some

https://github.com/haskellari/some

Version on this page:1.0.3@rev:2
LTS Haskell 24.18:1.0.6@rev:2
Stackage Nightly 2025-11-04:1.0.6@rev:2
Latest on Hackage:1.0.6@rev:2

See all snapshots some appears in

BSD-3-Clause licensed by James Cook, Oleg Grenrus
Maintained by Oleg Grenrus
This version can be pinned in stack with:some-1.0.3@sha256:938cec5fc0d3a08dde34cfc0acd5a0aa2e9fd489c9dbb64417f16588dfb47af0,2399

Module documentation for 1.0.3

Depends on 2 packages(full list with versions):
base, deepseq
Used by 6 packages in nightly-2022-09-07(full list with versions):
bin, dependent-sum, fin, lsp-types, singleton-bool, universe-some

This library defines an existential type Some.

data Some f where
    Some :: f a -> Some f

in few variants, and utilities to work with it.

If you are unsure which variant to use, use the one in Data.Some module.

Changes

1.0.3

  • Make GNFData PolyKinded.
  • Add GNFData ((:~:) a) and GNFData TypeRep instances

1.0.2

  • Explicitly mark Data.Some as Safe. It was previously inferred, yet it was Safe too, as it only re-exports other explicitly marked modules.
  • Allow base-4.15, GHC-9.0 compatibility

1.0.1

1.0.0.3

  • One less unsafeCoerce (thanks to David Feuer)

1.0.0.2

  • Broken release

1.0.0.1

1

  • Split out of dependent-sum
  • Have GADT, Newtype, Church variants
  • Add NFData instance