The eq package

[ Tags: bsd3, library, type-system ] [ Propose Tags ]

Leibnizian equality.

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Versions 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3,, 0.3.4,,,, 0.3.5, 0.3.6, 0.3.7,, 3.0, 3.1, 3.1.1, 4.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.1
Change log CHANGELOG.markdown
Dependencies base (==4.*), semigroupoids (>=4 && <6) [details]
License BSD3
Copyright Copyright (C) 2011-2013 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <>
Category Type System
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Source repo head: git clone git://
Uploaded Wed Jan 10 23:44:13 UTC 2018 by ryanglscott
Distributions LTSHaskell:4.1, NixOS:4.1, Stackage:4.1, openSUSE:4.0.4
Downloads 9820 total (91 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2018-01-10 [all 1 reports]
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Maintainer's Corner

For package maintainers and hackage trustees

Readme for eq-4.1

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This package provides a data type that witnesses equality between two types using Leibnizian equality.

It includes a refinement to the notion of Leibnizian equality by Oleg Kiselyov that permits it to refine equality using the injectively of type constructors via type families.

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on

-Edward Kmett