tweag/rules_haskell

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Haskell rules for Bazel.

Stars: 279
Forks: 93
Open beginner issues: 2
Indexed issues: 183
Avg merge: 13d 11h
Merged PRs (30d): 3

Dominant language: Starlark
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

183 open issues indexed

Provde hermetic toolchain for BCR modules Open

type: feature request

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

tweag/rules_haskell#2451 · Opened Sep 13, 2026
Mark Nix toolchain extensions as `os_dependent` and `arch_dependent` Open

P1

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

tweag/rules_haskell#2449 · 1 comment · Opened Aug 31, 2026
Make C-library symlink directory names in `pkgdb_to_bzl.py` deterministic Open

type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

tweag/rules_haskell#2448 · 3 comments · Opened Aug 31, 2026
Windows CI times out after 6 hours Open

os:windows type: bug

Difficulty 4/5 3-5 days Newbie friendliness 50/100

tweag/rules_haskell#2447 · 1 comment · Opened Aug 27, 2026
MODULE.bazel pins rules_sh@0.4.0 and aspect_rules_js@1.34.0 — neither works under Bazel 8 Open

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

tweag/rules_haskell#2426 · 1 comment · Opened May 20, 2026
Use rules_img instead of rules_oci Open

good first issue P3 type: feature request

Difficulty 3/5 1-2 days Newbie friendliness 68/100

tweag/rules_haskell#2425 · Opened May 19, 2026
Document functions, function args and return value Open

good first issue P3 type: feature request

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

tweag/rules_haskell#2327 · Opened Aug 18, 2025
`@bios` outputs source files in Bazel execroot (sandbox) Open

type: bug

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

tweag/rules_haskell#2325 · 2 comments · Opened Aug 12, 2025
Linker failure with rules_nixpkgs on MacOS Open

type: bug

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

tweag/rules_haskell#2317 · 4 comments · Opened Jul 16, 2025
Here is a test to validate subissues jira-gh sync up Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

tweag/rules_haskell#2307 · Opened Apr 29, 2025
Output base shows up in outputs (determinism issues) Open

P2 type: bug

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

tweag/rules_haskell#2278 · 1 comment · Opened Jan 14, 2025
Cannot build happy 2.x from hackage Open

type: bug

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

tweag/rules_haskell#2274 · 1 comment · Opened Dec 10, 2024
Replace Asterius with GHC WASM Open

P3 type: feature request

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

tweag/rules_haskell#2249 · Opened Sep 23, 2024
Using `nix_file_deps` in `rules_haskell_toolchains` extension causes error Open

type: bug

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

tweag/rules_haskell#2214 · Opened Jun 30, 2024
Support both bzlmod and nix in `start` script Open

type: feature request

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

tweag/rules_haskell#2204 · 2 reactions · Opened Jun 15, 2024
Project created through `start` script doesn't build in nix shell Open

dist:bindist os:linux

Difficulty 4/5 3-5 days Newbie friendliness 25/100

tweag/rules_haskell#2203 · 4 comments · Opened Jun 10, 2024
C-only cabal libraries fail to build with haddock = True Open

type: bug

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

tweag/rules_haskell#2200 · 3 comments · Opened May 28, 2024
Bazel 7.1.1 and nixpkgs GHC 9.8.2 produce dynamically linked haskell_cabal_binary's Open

type: bug

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

tweag/rules_haskell#2147 · Opened Apr 3, 2024
Dependency Dashboard Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

tweag/rules_haskell#2141 · Opened Mar 27, 2024
Docker example should work on Darwin Open

type: feature request

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

tweag/rules_haskell#2138 · Opened Mar 21, 2024
proto-len protoc plugin failures on windows with ghc 9.6.2 and 9.8.1 Open

type: bug

Difficulty 4/5 3-5 days Newbie friendliness 28/100

tweag/rules_haskell#2131 · Opened Mar 1, 2024
Haddock 2.30 faillure in profiling mode Open

type: bug

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

tweag/rules_haskell#2127 · Opened Feb 21, 2024
Buildifier support on NixOS with bzlmod Open

type: feature request

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

tweag/rules_haskell#2126 · 1 comment · Opened Feb 21, 2024
Update BCR presubmit to use `rules_haskell` instead of running the tests in `rules_haskell` Open

type: feature request

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

tweag/rules_haskell#2116 · 1 reaction · Opened Feb 7, 2024
`ghc_wrapper` is killed on MacOS arm64 running tests under `rules_haskell_tests` Open

type: bug

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

tweag/rules_haskell#2101 · 6 comments · Opened Jan 4, 2024
Refactor Bazel configuration to reduce/eliminate platform-specific flags Open

type: feature request

tweag/rules_haskell#2099 · 3 comments · 1 assignee · Opened Jan 4, 2024
Fix out-of-memory errors in CI when running `run-tests` in `rules_haskell_tests`. Open

type: bug

tweag/rules_haskell#2089 · 4 comments · 1 assignee · Opened Dec 19, 2023
Refactor `rules_haskell` CI workflow. Open

tweag/rules_haskell#2087 · 1 assignee · Opened Dec 19, 2023
add full support for GHC 9.8 nixpkgs Open

tweag/rules_haskell#2082 · 1 assignee · Opened Dec 14, 2023
add full support for GHC 9.8 bindist Open

tweag/rules_haskell#2081 · 2 assignees · Opened Dec 14, 2023
ghc-iserv BUS error / SIGSEGV on Darwin with GHC 9.6 / 9.8 Open

type: bug

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

tweag/rules_haskell#2073 · 2 comments · Opened Dec 7, 2023
Compilation of cabal libraries fails using awry cc tools / options Open

type: bug

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

tweag/rules_haskell#2070 · Opened Dec 5, 2023
Test GHC 9.4 with bzlmod on CI Open

type: feature request

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

tweag/rules_haskell#2006 · Opened Nov 3, 2023
Remove duplicate configuration in MODULE.bazel Open

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

tweag/rules_haskell#1976 · 2 comments · 1 reaction · Opened Oct 16, 2023
Buildifier support on NixOS with bzlmod Open

blocked

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

tweag/rules_haskell#1971 · Opened Oct 4, 2023
`stack update` failing on CI with `file returned by server too large` Open

type: bug

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

tweag/rules_haskell#1961 · Opened Sep 15, 2023
Support defining multiple stackage snapshots in module extension Open

P3

tweag/rules_haskell#1960 · 1 comment · 1 assignee · Opened Sep 15, 2023
CI job "Build & Test - Cross" fails Open

type: bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

tweag/rules_haskell#1927 · 1 comment · Opened Aug 2, 2023
Generate documentation for module extensions Open

blocked P3 type: documentation

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

tweag/rules_haskell#1919 · 1 comment · Opened Jun 30, 2023
Use hermetic python toolchain provided by rules_python Open

P3 type: feature request

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

tweag/rules_haskell#1915 · Opened Jun 29, 2023
Support for `alwayslink` cc_library targets Open

type: feature request

Difficulty 4/5 3-5 days Newbie friendliness 32/100

tweag/rules_haskell#1902 · 2 comments · Opened May 26, 2023
haskell_library may cause extra rebuilds when ABI is not changed Open

type: bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

tweag/rules_haskell#1883 · 3 comments · Opened Mar 23, 2023
Consider bzlmod extension for Cabal v2 integration Open

P4

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

tweag/rules_haskell#1882 · Opened Mar 20, 2023
Better Documentation for fully static distribution Open

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

tweag/rules_haskell#1881 · 3 comments · Opened Mar 20, 2023
Describe Gazelle Cabal and Gazelle haskell_module in documentation Open

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

tweag/rules_haskell#1880 · Opened Mar 20, 2023
HLS support Open

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

tweag/rules_haskell#1879 · 8 comments · Opened Mar 20, 2023
GHC version support Open

tweag/rules_haskell#1878 · 4 comments · 1 assignee · Opened Mar 20, 2023
Improve CI performance Open

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

tweag/rules_haskell#1877 · Opened Mar 20, 2023
Cabal >= 3.4 failing to load haskell_library dependencies with no version set Open

P3 type: feature request

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

tweag/rules_haskell#1876 · Opened Mar 15, 2023
Remove custom `Cabal//:Cabal` library when Cabal >= 3.10 can be used in `rules_haskell` tests Open

blocked

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

tweag/rules_haskell#1871 · 1 comment · 1 reaction · Opened Feb 27, 2023

tweag/rules_haskell

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