ndmitchell/hlint

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Stars: 1.6k
Forks: 210
Open beginner issues: 0
Indexed issues: 274

Dominant language: Haskell
License: No license data
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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274 open issues indexed

"Missing NOINLINE pragma" hint should check both for NOINLINE and OPAQUE Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

ndmitchell/hlint#1705 · Opened Aug 7, 2026
Support 'data' as well as 'pattern' in import/export lists Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

ndmitchell/hlint#1703 · 1 comment · Opened Jul 30, 2026
Allow checking for Map.Map occurrences Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

ndmitchell/hlint#1701 · Opened Jul 20, 2026
dead links Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

ndmitchell/hlint#1698 · Opened Jun 20, 2026
Export `declName` from public API Open

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

ndmitchell/hlint#1697 · Opened Jun 13, 2026
Support do-notation patterns in custom hint rules (e.g. `_ <- f x` → `f_ x`) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

ndmitchell/hlint#1695 · Opened Apr 23, 2026
Wrong Use record patterns hint when type applications are present Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

ndmitchell/hlint#1679 · Opened Apr 12, 2026
Make it possible to restrict the number of explicit imports Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

ndmitchell/hlint#1676 · Opened Mar 20, 2026
Suggesting to replace `intercalate " "` with `unwords` is incorrect in the presence of `OverloadedStrings` Open

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

ndmitchell/hlint#1674 · Opened Mar 7, 2026
`cabal install hlint` fails with ghc-9.14.1 Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

ndmitchell/hlint#1672 · 3 reactions · Opened Dec 20, 2025
Make hlint self-weeding Open

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

ndmitchell/hlint#1669 · Opened Dec 11, 2025
Add a way to make enable predefined groups only in specific modules Open

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

ndmitchell/hlint#1668 · Opened Dec 4, 2025
Distinguish between truly redundant parens and technically redundant parens Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

ndmitchell/hlint#1665 · 2 comments · Opened Sep 18, 2025
Take over `cpphs` ? Open

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

ndmitchell/hlint#1664 · Opened Sep 14, 2025
`mode :: Mode (CmdArgs Cmd) ` memoizes async exceptions, breaking HLS Shake restarts Open

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

ndmitchell/hlint#1663 · 1 comment · Opened Sep 7, 2025
How do I enforce `import Data.Set (Set); import qualified Data.Set as Set`? Open

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

ndmitchell/hlint#1658 · 2 comments · Opened Aug 14, 2025
Remove malfunctioning hint "Avoid NonEmpty.unzip" Open

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

ndmitchell/hlint#1657 · Opened Jul 14, 2025
Don't print irrelevant where clauses Open

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

ndmitchell/hlint#1653 · Opened Jun 13, 2025
Warn on unused hints Open

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

ndmitchell/hlint#1651 · Opened Jun 4, 2025
False positive "Unused LANGUAGE pragma" Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

ndmitchell/hlint#1650 · 2 comments · Opened May 24, 2025
Wildcard rules for imports have their relevant properties unioned, including exclusions Open

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

ndmitchell/hlint#1647 · 2 comments · Opened May 21, 2025
`ignore: {}` not compatible with import style rules for multiple modules Open

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

ndmitchell/hlint#1644 · Opened Apr 30, 2025
Refactors across comments yield invalid code Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

ndmitchell/hlint#1643 · Opened Apr 20, 2025
`hlint-3.10-x86_64-osx.tar.gz` is actually for ARM64, not x86_64 Open

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

ndmitchell/hlint#1640 · 2 comments · Opened Apr 2, 2025
Allow `modules` in a `group` Open

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

ndmitchell/hlint#1639 · Opened Mar 20, 2025
Proposal: don't include the "use void" hint in the default hints Open

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

ndmitchell/hlint#1638 · 1 reaction · Opened Mar 12, 2025
Make it possible to forbid "`fromIntegral` without visible type arguments" Open

good first issue

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

ndmitchell/hlint#1637 · 9 comments · 5 reactions · Opened Feb 17, 2025
Incorrect "Parenthesize unary negation" suggestion Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

ndmitchell/hlint#1636 · 1 comment · Opened Feb 16, 2025
Support `include` directives Open

good first issue

Difficulty 4/5 3-5 days Newbie friendliness 45/100

ndmitchell/hlint#1632 · 3 comments · Opened Jan 24, 2025
`modules` without `within` does nothing Open

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

ndmitchell/hlint#1631 · 1 comment · Opened Jan 24, 2025
Hint `Redundant <&>` suggests code obfuscation Open

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

ndmitchell/hlint#1624 · 3 comments · Opened Dec 9, 2024
`within` changes the behavior of `modules: {as: }` Open

good first issue

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

ndmitchell/hlint#1615 · 3 comments · Opened Sep 6, 2024
How to debug custom lint rules Open

good first issue

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

ndmitchell/hlint#1612 · 1 comment · Opened Aug 28, 2024
request for support of `ghc-lib-parser` and `ghc-lib-parser-ex` newer versions Open

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

ndmitchell/hlint#1607 · 1 comment · Opened Jul 9, 2024
How to ban a single extension Open

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

ndmitchell/hlint#1605 · 1 comment · Opened Jul 4, 2024
Setting Language Disables Other Extensions Open

bug

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

ndmitchell/hlint#1604 · 7 comments · Opened Jun 26, 2024
use `: []` is not correct in the presence of `OverloadedLists` Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

ndmitchell/hlint#1602 · 1 comment · Opened Jun 9, 2024
Incorrect "Use map" when folding over a `Foldable` Open

good first issue

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

ndmitchell/hlint#1601 · 1 comment · Opened May 29, 2024
generate-summary doesn't output html-entities Open

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

ndmitchell/hlint#1598 · Opened May 24, 2024
Hlint fails if it encounters any non-UTF8 files Open

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

ndmitchell/hlint#1595 · Opened May 15, 2024
`cabal install hlint` fails with ghc-9.10.1 Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

ndmitchell/hlint#1593 · 3 comments · 1 reaction · Opened May 11, 2024
hlint -g also checks untracked files Open

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

ndmitchell/hlint#1592 · Opened May 8, 2024
Use list literal suggestions with `:|` Open

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

ndmitchell/hlint#1590 · Opened May 6, 2024
`Redundant <$>` should not trigger for lengthy `LambdaCase` Open

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

ndmitchell/hlint#1589 · Opened May 6, 2024
Rules for list literals Open

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

ndmitchell/hlint#1588 · Opened May 3, 2024
Consider using less morally-loaded language in hints. Open

Difficulty 1/5 Under an hour Newbie friendliness 38/100

ndmitchell/hlint#1584 · 3 comments · Opened Apr 10, 2024
Repeated hint names Open

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

ndmitchell/hlint#1582 · Opened Mar 26, 2024
Make ignore-glob a config key in .hlint.yaml Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

ndmitchell/hlint#1577 · 1 reaction · Opened Feb 28, 2024
Recommend `Data.Foldable1` over `Data.List.{maximum,minimum}{,By}` Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

ndmitchell/hlint#1576 · Opened Feb 28, 2024
Incorrect redundant backet suggestion with `BlockArguments` and operator sections Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

ndmitchell/hlint#1573 · Opened Feb 23, 2024

ndmitchell/hlint

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