system-f/validation

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A data-type like Either but with an accumulating Applicative

Stars: 103
Forks: 26
Open beginner issues: 0
Indexed issues: 21

Dominant language: Haskell
License: No license data
Last GitHub push: Aug 21, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

Open All

21 open issues indexed

Access to pre-1.2.0 utility functions Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

system-f/validation#64 · 2 comments · Opened Jul 9, 2026
Add selective instances Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

system-f/validation#63 · Opened Sep 16, 2024
Release supporting deepseq-1.5 Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

system-f/validation#62 · 1 comment · Opened Dec 28, 2023
Bring back validation to LTS Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

system-f/validation#61 · 1 comment · Opened Nov 8, 2023
Release supporting semigroupoids-6 Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

system-f/validation#60 · 1 comment · Opened Jul 10, 2023
Allow building the test suite with lens 5.* Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

system-f/validation#57 · Opened Mar 25, 2022
Add a lazier version Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

system-f/validation#53 · 4 comments · Opened Jun 11, 2021
Delete nix build Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

system-f/validation#46 · 1 comment · Opened Mar 3, 2021
Set up continuous integration testing, such as Github Actions Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

system-f/validation#45 · Opened Mar 2, 2021
Compilation Error with lens-4.20 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

system-f/validation#43 · Opened Nov 22, 2020
Alternative instance Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

system-f/validation#42 · 1 comment · Opened Feb 23, 2020
Using this package (adding to the cabal file of an existing project) via `cabal` or `stack` Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

system-f/validation#41 · 1 comment · Opened Aug 27, 2019
Add more instances that are included in base Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

system-f/validation#36 · Opened Apr 19, 2019
Why a Semigroup instance? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

system-f/validation#35 · 1 comment · Opened Apr 12, 2019
Help in creating a better example Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

system-f/validation#34 · 2 comments · Opened Apr 4, 2019
Add power to validate and ensure Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

system-f/validation#32 · 2 comments · Opened Mar 21, 2019
Does it make sense to provide isSuccess and isFailure functions? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

system-f/validation#28 · 2 comments · Opened Sep 17, 2018
Stack support found Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

system-f/validation#27 · 1 comment · Opened Jul 1, 2018
[minor] add aliases/patterns with `Acc` prefix for backwards compatibility Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

system-f/validation#26 · Opened Mar 1, 2018
examples are a bit unwieldly Open

Difficulty 3/5 1-2 days Newbie friendliness 32/100

system-f/validation#2 · Opened Feb 17, 2015
Remove dependency on lens Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

system-f/validation#1 · 8 comments · 1 reaction · Opened Feb 17, 2015

system-f/validation

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