@hackage / contravariant

Metadata

• Last updated 10 Jan 2026, by ryanglscott
• License BSD-3-Clause

• Maintained by: Edward A. Kmett <ekmett@gmail.com>

• Lottery factor: 3 New

  The number of people with uploader permission on @hackage/contravariant who have released something to @hackage in the last 2 years (i.e. the number of people likely able to release critical fixes in a timely manner)

Links

• Homepage
• Documentation
• Source repository

Installation

Tested Compilers

1. 9.12.2
2. 9.10.3
3. 9.8.4
4. 9.6.7
5. 9.4.8
6. 9.2.8
7. 9.0.2
8. 8.10.7
9. 8.8.4
10. 8.6.5
11. 8.4.4
12. 8.2.2
13. 8.0.2

Package Flags

Use the -f option with cabal commands to enable flags

statevar (on by default)

You can disable the use of the StateVar package using `-f-StateVar`.

Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.