chore: Remove remaining Bazel-related files r/31

236 files changed, 0 insertions, 4522 deletions

diff --git a/third_party/bazel/rules_haskell/tests/BUILD.bazel b/third_party/bazel/rules_haskell/tests/BUILD.bazel
deleted file mode 100644
index 276db5546332..000000000000
--- a/third_party/bazel/rules_haskell/tests/BUILD.bazel
+++ /dev/null
@@ -1,322 +0,0 @@
-load(":inline_tests.bzl", "sh_inline_test")
-load("@bazel_tools//tools/build_rules:test_rules.bzl", "rule_test")
-load("//tests:rule_test_exe.bzl", "rule_test_exe")
-load(
-    "@io_tweag_rules_haskell//haskell:c2hs.bzl",
-    "c2hs_toolchain",
-)
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_binary",
-    "haskell_doctest_toolchain",
-    "haskell_proto_toolchain",
-    "haskell_test",
-    "haskell_toolchain",
-)
-load(
-    "//:constants.bzl",
-    "test_ghc_version",
-)
-
-package(default_testonly = 1)
-
-haskell_doctest_toolchain(
-    name = "doctest-toolchain",
-    doctest = "@hackage-doctest//:bin",
-    tags = ["requires_doctest"],
-)
-
-# This toolchain is morally testonly. However, that would break our
-# tests of haskell_library_rules: aspects of non-testonly
-# proto_library rules (from com_google_protobuf) can't themselves be
-# testonly.
-
-haskell_proto_toolchain(
-    name = "protobuf-toolchain",
-    testonly = 0,
-    plugin = "@hackage-proto-lens-protoc//:bin/proto-lens-protoc",
-    protoc = "@com_google_protobuf//:protoc",
-    tags = ["requires_hackage"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:bytestring",
-        "//tests/hackage:containers",
-        "//tests/hackage:deepseq",
-        "//tests/hackage:mtl",
-        "//tests/hackage:text",
-        "@hackage//:data-default-class",
-        "@hackage//:lens-family",
-        "@hackage//:lens-family-core",
-        "@hackage//:lens-labels",
-        "@hackage//:proto-lens",
-    ],
-)
-
-c2hs_toolchain(
-    name = "c2hs-toolchain",
-    c2hs = "@hackage-c2hs//:bin",
-    tags = ["requires_c2hs"],
-)
-
-rule_test_exe(
-    name = "test-binary-simple",
-    size = "small",
-    generates = ["binary-simple"],
-    rule = "//tests/binary-simple",
-)
-
-rule_test_exe(
-    name = "test-binary-custom-main",
-    size = "small",
-    generates = ["binary-custom-main"],
-    rule = "//tests/binary-custom-main",
-)
-
-rule_test(
-    name = "test-binary-with-lib",
-    size = "small",
-    generates = ["binary-with-lib"],
-    rule = "//tests/binary-with-lib",
-)
-
-rule_test(
-    name = "test-binary-with-prebuilt",
-    size = "small",
-    generates = ["binary-with-prebuilt"],
-    rule = "//tests/binary-with-prebuilt",
-    tags = ["requires_hackage"],
-)
-
-rule_test(
-    name = "test-binary-with-main",
-    size = "small",
-    generates = ["binary-with-main"],
-    rule = "//tests/binary-with-main",
-)
-
-rule_test(
-    name = "test-binary-with-sysdeps",
-    size = "small",
-    generates = ["binary-with-sysdeps"],
-    rule = "//tests/binary-with-sysdeps",
-    tags = ["requires_zlib"],
-)
-
-sh_test(
-    name = "test-binary-with-data",
-    size = "small",
-    srcs = ["//tests/binary-with-data"],
-    args = ["$(location //tests/binary-with-data:bin1)"],
-    data = ["//tests/binary-with-data:bin1"],
-    tags = ["requires_hackage"],
-)
-
-rule_test(
-    name = "test-library-deps",
-    size = "small",
-    generates = select({
-        "@bazel_tools//src/conditions:darwin": [
-            "libHStestsZSlibrary-depsZSlibrary-deps-ghc{}.dylib".format(test_ghc_version),
-            "libHStestsZSlibrary-depsZSlibrary-deps.a",
-        ],
-        "@bazel_tools//src/conditions:windows": [
-            "libHStestsZSlibrary-depsZSlibrary-deps-ghc{}.dll".format(test_ghc_version),
-            "libHStestsZSlibrary-depsZSlibrary-deps.a",
-        ],
-        "//conditions:default": [
-            "libHStestsZSlibrary-depsZSlibrary-deps-ghc{}.so".format(test_ghc_version),
-            "libHStestsZSlibrary-depsZSlibrary-deps.a",
-        ],
-    }),
-    rule = "//tests/library-deps",
-)
-
-rule_test(
-    name = "test-hsc",
-    size = "small",
-    generates = ["hsc"],
-    rule = "//tests/hsc",
-)
-
-rule_test(
-    name = "test-haddock",
-    size = "small",
-    generates = [
-        "haddock/index",
-        "haddock/testsZShaddockZShaddock-lib-a",
-        "haddock/testsZShaddockZShaddock-lib-b",
-        "haddock/testsZShaddockZShaddock-lib-deep",
-    ],
-    rule = "//tests/haddock",
-    tags = ["requires_hackage"],
-)
-
-rule_test(
-    name = "test-haskell_lint-library",
-    size = "small",
-    generates = [
-        "lint-log-lib-b",
-    ],
-    rule = "//tests/haskell_lint:lint-lib-b",
-)
-
-rule_test(
-    name = "test-haskell_lint-binary",
-    size = "small",
-    generates = [
-        "lint-log-bin",
-    ],
-    rule = "//tests/haskell_lint:lint-bin",
-)
-
-rule_test(
-    name = "test-haskell_doctest",
-    size = "small",
-    generates = [
-        "doctest-log-doctest-lib-lib-b",
-    ],
-    rule = "//tests/haskell_doctest:doctest-lib",
-    tags = ["requires_doctest"],
-)
-
-rule_test(
-    name = "test-haskell_test",
-    size = "small",
-    generates = ["haskell_test"],
-    rule = "//tests/haskell_test:haskell_test",
-)
-
-rule_test(
-    name = "test-java_classpath",
-    size = "small",
-    generates = ["java_classpath"],
-    rule = "//tests/java_classpath",
-)
-
-rule_test(
-    name = "test-cc_haskell_import-cc-link",
-    size = "small",
-    generates = ["cc-bin"],
-    rule = "//tests/cc_haskell_import:cc-bin",
-    tags = ["requires_threaded_rts"],
-)
-
-sh_test(
-    name = "test-cc_haskell_import_python",
-    size = "small",
-    srcs = ["scripts/exec.sh"],
-    args = ["tests/cc_haskell_import/python_add_one"],
-    data = [
-        "//tests/cc_haskell_import:python_add_one",
-        "@bazel_tools//tools/bash/runfiles",
-    ],
-    tags = ["requires_threaded_rts"],
-)
-
-sh_inline_test(
-    name = "test-haskell_binary-with-link-flags",
-    size = "small",
-    args = ["$(location //tests/binary-with-link-flags:binary-with-link-flags)"],
-    data = ["//tests/binary-with-link-flags"],
-    script = """\
-set -e
-
-# Fails if executable was linked without -threaded flag.
-$1 +RTS -N
-""",
-)
-
-rule_test(
-    name = "test-lhs",
-    size = "small",
-    generates = ["lhs-bin"],
-    rule = "//tests/lhs:lhs-bin",
-)
-
-rule_test(
-    name = "test-hs-boot",
-    size = "small",
-    generates = ["hs-boot"],
-    rule = "//tests/hs-boot:hs-boot",
-)
-
-rule_test(
-    name = "test-textual-hdrs",
-    size = "small",
-    generates = ["textual-hdrs"],
-    rule = "//tests/textual-hdrs:textual-hdrs",
-)
-
-rule_test(
-    name = "test-two-libs",
-    size = "small",
-    generates = ["two-libs"],
-    rule = "//tests/two-libs:two-libs",
-)
-
-genrule(
-    name = "run-bin-with-lib",
-    outs = ["dummy"],
-    cmd = """sh -c '
-    set -e
-    $(location //tests/binary-with-lib:binary-with-lib)
-    touch $(location dummy)
-'""",
-    tools = ["//tests/binary-with-lib"],
-)
-
-rule_test(
-    name = "test-run-bin-with-lib",
-    size = "small",
-    generates = ["dummy"],
-    rule = "//tests:run-bin-with-lib",
-)
-
-genrule(
-    name = "run-bin-with-lib-dynamic",
-    outs = ["dyn-dummy"],
-    cmd = """sh -c '
-    set -e
-    $(location //tests/binary-with-lib-dynamic:binary-with-lib-dynamic)
-    touch $(location dyn-dummy)
-'""",
-    tools = ["//tests/binary-with-lib-dynamic"],
-)
-
-rule_test(
-    name = "test-run-bin-with-lib-dynamic",
-    size = "small",
-    generates = ["dyn-dummy"],
-    rule = "//tests:run-bin-with-lib-dynamic",
-)
-
-genrule(
-    name = "run-bin-with-c-lib",
-    outs = ["c-dummy"],
-    cmd = """sh -c '
-    set -e
-    $(location //tests/c-compiles)
-    touch $(location c-dummy)
-'""",
-    tools = ["//tests/c-compiles"],
-)
-
-rule_test(
-    name = "test-run-bin-with-c-lib",
-    size = "small",
-    generates = ["c-dummy"],
-    rule = "//tests:run-bin-with-c-lib",
-)
-
-# This is the test runner
-haskell_binary(
-    name = "run-tests",
-    srcs = ["RunTests.hs"],
-    tags = ["requires_hackage"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:process",
-        "@hackage//:hspec",
-        "@hackage//:hspec-core",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/RunTests.hs b/third_party/bazel/rules_haskell/tests/RunTests.hs
deleted file mode 100644
index b6218bbcefc2..000000000000
--- a/third_party/bazel/rules_haskell/tests/RunTests.hs
+++ /dev/null
@@ -1,155 +0,0 @@
-{-# OPTIONS -Wall #-}
-
-{-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE QuasiQuotes #-}
-
-import Data.Foldable (for_)
-import Data.List (isInfixOf, sort)
-import System.Exit (ExitCode(..))
-
-import qualified System.Process as Process
-import Test.Hspec.Core.Spec (SpecM)
-import Test.Hspec (hspec, it, describe, runIO, shouldSatisfy, expectationFailure)
-
-main :: IO ()
-main = hspec $ do
-  it "bazel lint" $ do
-    assertSuccess (bazel ["run", "//:buildifier"])
-
-  it "bazel test" $ do
-    assertSuccess (bazel ["test", "//...", "--build_tests_only"])
-
-  it "haddock links" $ do
-    -- Test haddock links
-    -- All haddock tests are stored inside //tests/haddock
-    -- Temporaries files appears inside /doc-.... outputs and are ignored
-
-    -- the copy / chmod is here to workaround the fact that
-    -- linkchecker is dropping privileges to "nobody" user if called
-    -- from root, which is the case on CI.
-    assertSuccess (safeShell
-      [ "bazel build --config=ci //tests/haddock/..."
-      , "pwd=$(pwd)"
-      , "cd $(mktemp -d)"
-      , "cp -r $pwd/bazel-ci-bin/tests/haddock ."
-      , "chmod -R o+r ."
-      , "linkchecker . --ignore-url=/doc-"
-      ])
-
-  it "bazel test prof" $ do
-    assertSuccess (bazel ["test", "-c", "dbg", "//...", "--build_tests_only"])
-
-  describe "repl" $ do
-    it "for libraries" $ do
-      assertSuccess (bazel ["run", "//tests/repl-targets:hs-lib@repl", "--", "-ignore-dot-ghci", "-e", "show (foo 10) ++ bar ++ baz ++ gen"])
-      assertSuccess (bazel ["run", "//tests/repl-targets:hs-lib-bad@repl", "--", "-ignore-dot-ghci", "-e", "1 + 2"])
-
-    it "for binaries" $ do
-      assertSuccess (bazel ["run", "//tests/repl-targets:hs-bin@repl", "--", "-ignore-dot-ghci", "-e", ":main"])
-
-      assertSuccess (bazel ["run", "//tests/binary-indirect-cbits:binary-indirect-cbits@repl", "--", "-ignore-dot-ghci", "-e", ":main"])
-
-    -- Test `compiler_flags` from toolchain and rule for REPL
-    it "compiler flags" $ do
-      assertSuccess (bazel ["run", "//tests/repl-flags:compiler_flags@repl", "--", "-ignore-dot-ghci", "-e", ":main"])
-
-    -- Test `repl_ghci_args` from toolchain and rule for REPL
-    it "repl flags" $ do
-      assertSuccess (bazel ["run", "//tests/repl-flags:repl_flags@repl", "--", "-ignore-dot-ghci", "-e", "foo"])
-
-  describe "multi_repl" $ do
-    it "loads transitive library dependencies" $ do
-      let p' (stdout, _stderr) = lines stdout == ["tests/multi_repl/bc/src/BC/C.hs"]
-      outputSatisfy p' (bazel ["run", "//tests/multi_repl:c_only_repl", "--", "-ignore-dot-ghci", "-e", ":show targets"])
-    it "loads transitive source dependencies" $ do
-      let p' (stdout, _stderr) = sort (lines stdout) == ["tests/multi_repl/a/src/A/A.hs","tests/multi_repl/bc/src/BC/B.hs","tests/multi_repl/bc/src/BC/C.hs"]
-      outputSatisfy p' (bazel ["run", "//tests/multi_repl:c_multi_repl", "--", "-ignore-dot-ghci", "-e", ":show targets"])
-
-  it "startup script" $ do
-    assertSuccess (safeShell ["./tests/run-start-script.sh"])
-
-  describe "failures" $ do
-    all_failure_tests <- bazelQuery "kind(rule, //tests/failures/...) intersect attr('tags', 'manual', //tests/failures/...)"
-
-    for_ all_failure_tests $ \test -> do
-      it test $ do
-        assertFailure (bazel ["build", "test"])
-
-  -- Test that the repl still works if we shadow some Prelude functions
-  it "repl name shadowing" $ do
-    let p (stdout, stderr) = not $ any ("error" `isInfixOf`) [stdout, stderr]
-    outputSatisfy p (bazel ["run", "//tests/repl-name-conflicts:lib@repl", "--", "-ignore-dot-ghci", "-e", "stdin"])
-
-  it "bazel test examples" $ do
-    assertSuccess (bazel ["test", "@io_tweag_rules_haskell_examples//..."])
-
-  it "bazel test tutorial" $ do
-    assertSuccess (bazel ["test", "@io_tweag_rules_haskell_tutorial//..."])
-
--- * Bazel commands
-
--- | Returns a bazel command line suitable for CI
--- This should be called with the action as first item of the list. e.g 'bazel ["build", "//..."]'.
-bazel :: [String] -> Process.CreateProcess
--- Note: --config=ci is intercalated between the action and the list
--- of arguments. It should appears after the action, but before any
--- @--@ following argument.
-bazel (command:args) = Process.proc "bazel" (command:"--config=ci":args)
-bazel [] = Process.proc "bazel" []
-
--- | Runs a bazel query and return the list of matching targets
-bazelQuery :: String -> SpecM a [String]
-bazelQuery q = lines <$> runIO (Process.readProcess "bazel" ["query", q] "")
-
--- * Action helpers
-
--- | Ensure that @(stdout, stderr)@ of the command satisfies a predicate
-outputSatisfy
-  :: ((String, String) -> Bool)
-  -> Process.CreateProcess
-  -> IO ()
-outputSatisfy predicate cmd = do
-  (exitCode, stdout, stderr) <- Process.readCreateProcessWithExitCode cmd ""
-
-  case exitCode of
-    ExitSuccess -> (stdout, stderr) `shouldSatisfy` predicate
-    ExitFailure _ -> expectationFailure (formatOutput exitCode stdout stderr)
-
--- | The command must success
-assertSuccess :: Process.CreateProcess -> IO ()
-assertSuccess = outputSatisfy (const True)
-
--- | The command must fail
-assertFailure :: Process.CreateProcess -> IO ()
-assertFailure cmd = do
-  (exitCode, stdout, stderr) <- Process.readCreateProcessWithExitCode cmd ""
-
-  case exitCode of
-    ExitFailure _ -> pure ()
-    ExitSuccess -> expectationFailure ("Unexpected success of a failure test with output:\n" ++ formatOutput exitCode stdout stderr)
-
--- | Execute in a sub shell the list of command
--- This will fail if any of the command in the list fail
-safeShell :: [String] -> Process.CreateProcess
-safeShell l = Process.shell (unlines ("set -e":l))
-
--- * Formatting helpers
-
-formatOutput :: ExitCode -> String -> String -> String
-formatOutput exitcode stdout stderr =
-  let
-    header = replicate 20 '-'
-    headerLarge = replicate 20 '='
-
-  in unlines [
-      headerLarge
-    , "Exit Code: " <> show exitcode
-    , headerLarge
-    , "Standard Output"
-    , header
-    , stdout
-    , headerLarge
-    , "Error Output"
-    , header
-    , stderr
-    , header]
diff --git a/third_party/bazel/rules_haskell/tests/binary-custom-main/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-custom-main/BUILD.bazel
deleted file mode 100644
index c749b85eaac4..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-custom-main/BUILD.bazel
+++ /dev/null
@@ -1,17 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "binary-custom-main",
-    srcs = ["Main.hs"],
-    expected_covered_expressions_percentage = 50,
-    tags = [
-        "coverage-compatible",
-    ],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-custom-main/Main.hs b/third_party/bazel/rules_haskell/tests/binary-custom-main/Main.hs
deleted file mode 100644
index c8dbf9fbdb9e..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-custom-main/Main.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Main (main) where
-
-main :: IO ()
-main = return ()
diff --git a/third_party/bazel/rules_haskell/tests/binary-dynamic/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-dynamic/BUILD.bazel
deleted file mode 100644
index 765963f19fe0..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-dynamic/BUILD.bazel
+++ /dev/null
@@ -1,14 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "binary-dynamic",
-    srcs = ["Main.hs"],
-    linkstatic = False,
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-dynamic/Main.hs b/third_party/bazel/rules_haskell/tests/binary-dynamic/Main.hs
deleted file mode 100644
index 2048dbdecd9a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-dynamic/Main.hs
+++ /dev/null
@@ -1,3 +0,0 @@
-module Main where
-
-main = putStrLn "hello world"
diff --git a/third_party/bazel/rules_haskell/tests/binary-exe-path/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-exe-path/BUILD.bazel
deleted file mode 100644
index 0cb617a50877..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-exe-path/BUILD.bazel
+++ /dev/null
@@ -1,13 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "binary-exe-path",
-    srcs = ["Main.hs"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-exe-path/Main.hs b/third_party/bazel/rules_haskell/tests/binary-exe-path/Main.hs
deleted file mode 100644
index 6a02bb9fc8ec..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-exe-path/Main.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-module Main where
-
-import System.Environment
-
-main = getExecutablePath >>= putStrLn
diff --git a/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/BUILD.bazel
deleted file mode 100644
index 6668f230e508..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/BUILD.bazel
+++ /dev/null
@@ -1,36 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_binary",
-    "haskell_library",
-)
-
-haskell_binary(
-    name = "binary-indirect-cbits",
-    srcs = ["Main.hs"],
-    linkstatic = False,
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/library-with-cbits",
-    ],
-)
-
-haskell_binary(
-    name = "binary-indirect-cbits-partially-static",
-    srcs = ["Main.hs"],
-    linkstatic = False,
-    deps = [
-        "//tests/hackage:base",
-        "//tests/library-with-cbits:library-with-cbits-static",
-    ],
-)
-
-haskell_binary(
-    name = "binary-indirect-cbits-fully-static",
-    srcs = ["Main.hs"],
-    linkstatic = True,
-    deps = [
-        "//tests/hackage:base",
-        "//tests/library-with-cbits:library-with-cbits-static",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Main.hs b/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Main.hs
deleted file mode 100644
index c9d7037e23c2..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Main.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-import AddOne
-
-main :: IO ()
-main = do
-  putStrLn $ show $ addOne 2
diff --git a/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Wrapper.hs b/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Wrapper.hs
deleted file mode 100644
index 00b6be28f405..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Wrapper.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-module Wrapper
-  ( module AddOne
-  ) where
-
-import AddOne
diff --git a/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Wrapper2.hs b/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Wrapper2.hs
deleted file mode 100644
index a39233a84271..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-indirect-cbits/Wrapper2.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-module Wrapper2
-  ( module AddOne
-  , addOne2
-  ) where
-
-import AddOne
-import qualified Wrapper
-
-addOne2 = Wrapper.addOne
diff --git a/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/BUILD.bazel
deleted file mode 100644
index 4e8e7cfa6684..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/BUILD.bazel
+++ /dev/null
@@ -1,118 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-load("//tests:inline_tests.bzl", "sh_inline_test")
-
-# test whether `linkstatic` works as expected
-package(default_testonly = 1)
-
-cc_library(
-    name = "c-lib",
-    srcs = ["c-lib.c"],
-)
-
-haskell_library(
-    name = "HsLib",
-    srcs = ["HsLib.hs"],
-    deps = [
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_test(
-    name = "binary-static",
-    srcs = ["Main.hs"],
-    linkstatic = True,
-    deps = [
-        ":HsLib",
-        ":c-lib",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_test(
-    name = "binary-dynamic",
-    srcs = ["Main.hs"],
-    linkstatic = False,
-    deps = [
-        ":HsLib",
-        ":c-lib",
-        "//tests/hackage:base",
-    ],
-)
-
-config_setting(
-    name = "debug_build",
-    values = {
-        "compilation_mode": "dbg",
-    },
-)
-
-# Ensure that linkstatic=True only links to static library targets.
-sh_inline_test(
-    name = "test-binary-static-symbols",
-    size = "small",
-    args = [
-        "$(rootpath :binary-static)",
-    ],
-    data = [
-        ":binary-static",
-    ],
-    script = """
-    set -eo pipefail
-    binary="$1"
-    # Symbols are prefixed with underscore on MacOS but not on Linux.
-    if nm -u "$binary" | grep -q "\<_\?value"; then
-        echo "C library dependency not linked statically: ${binary}"
-        exit 1
-    fi
-    if nm -u "$binary" | grep -q HsLib_value_closure; then
-        echo "Haskell library dependency not linked statically ${binary}"
-        exit 1
-    fi
-    """,
-)
-
-# Ensure that linkstatic=False only links to dynamic library targets.
-sh_inline_test(
-    name = "test-binary-dynamic-symbols",
-    size = "small",
-    args = [
-        "$(rootpath :binary-dynamic)",
-    ] + select({
-        ":debug_build": ["dbg"],
-        "//conditions:default": ["rls"],
-    }),
-    data = [
-        ":binary-dynamic",
-    ],
-    script = """
-    set -eo pipefail
-    binary="$1"
-    mode="$2"
-    if [[ $mode = dbg ]]; then
-        # Skip test in debug builds. Debug mode forces static linking.
-        exit 0
-    fi
-    # Symbols are prefixed with underscore on MacOS but not on Linux.
-    if ! nm -u "$binary" | grep -q "\<_\?value"; then
-        echo "C library dependency not linked dynamically"
-        exit 1
-    fi
-    if ! nm -u "$binary" | grep -q HsLib_value_closure; then
-        echo "Haskell library dependency not linked dynamically"
-        exit 1
-    fi
-    """,
-)
-
-test_suite(
-    name = "binary-linkstatic-flag",
-    tests = [
-        ":test-binary-dynamic-symbols",
-        ":test-binary-static-symbols",
-    ],
-    visibility = ["//visibility:public"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/HsLib.hs b/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/HsLib.hs
deleted file mode 100644
index 68271826d7ee..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/HsLib.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module HsLib (value) where
-
-value :: Int
-value = 13
diff --git a/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/Main.hs b/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/Main.hs
deleted file mode 100644
index 7836c2220277..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/Main.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
-
-module Main (main) where
-
-import qualified HsLib
-
-foreign import ccall "value" value :: Int
-
-main = print $ HsLib.value + value
diff --git a/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/c-lib.c b/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/c-lib.c
deleted file mode 100644
index 9a1e526017ec..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-linkstatic-flag/c-lib.c
+++ /dev/null
@@ -1 +0,0 @@
-int value() { return 29; }
diff --git a/third_party/bazel/rules_haskell/tests/binary-simple/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-simple/BUILD.bazel
deleted file mode 100644
index d44d395fb8c7..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-simple/BUILD.bazel
+++ /dev/null
@@ -1,15 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "binary-simple",
-    srcs = ["Main.hs"],
-    expected_covered_expressions_percentage = 100,
-    tags = ["coverage-compatible"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-simple/Main.hs b/third_party/bazel/rules_haskell/tests/binary-simple/Main.hs
deleted file mode 100644
index 2048dbdecd9a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-simple/Main.hs
+++ /dev/null
@@ -1,3 +0,0 @@
-module Main where
-
-main = putStrLn "hello world"
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-compiler-flags/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-compiler-flags/BUILD.bazel
deleted file mode 100644
index 727d8447ab4b..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-compiler-flags/BUILD.bazel
+++ /dev/null
@@ -1,18 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "binary-with-compiler-flags",
-    srcs = ["Main.hs"],
-    # Flags that require -threaded, which we should get from the toolchain's
-    # compiler_flags. Include spaces to validate proper quoting:
-    compiler_flags = [
-        "-with-rtsopts=-N2 -qg -I0 -n2m -A128m",
-        "-XLambdaCase",
-    ],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-compiler-flags/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-compiler-flags/Main.hs
deleted file mode 100644
index b95db17f76da..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-compiler-flags/Main.hs
+++ /dev/null
@@ -1,13 +0,0 @@
--- Expects to pull -XStandaloneDeriving from the default compiler flags.
-module Main (main) where
-
-data Foo = Foo
-deriving instance Show Foo
-
--- Expects -XLambdaCase to be passed via the 'compiler_flags' rule attribute.
-dummyId :: Foo -> Foo
-dummyId = \case
-  Foo -> Foo
-
-main :: IO ()
-main = print $ dummyId Foo
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-data/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-data/BUILD.bazel
deleted file mode 100644
index 200498f64018..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-data/BUILD.bazel
+++ /dev/null
@@ -1,31 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-# XXX: on Windows those tests need `--experimental_enable_runfiles` to succeed
-# XXX: see: https://github.com/tweag/rules_haskell/issues/647#issuecomment-459001362
-
-haskell_test(
-    name = "bin1",
-    srcs = ["bin1.hs"],
-    # Regular file input:
-    data = ["bin1-input"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_test(
-    name = "binary-with-data",
-    srcs = ["bin2.hs"],
-    args = ["$(location :bin1)"],
-    data = [":bin1"],
-    tags = ["requires_hackage"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:process",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-data/bin1-input b/third_party/bazel/rules_haskell/tests/binary-with-data/bin1-input
deleted file mode 100644
index 12f00e90b6ef..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-data/bin1-input
+++ /dev/null
@@ -1 +0,0 @@
-contents
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-data/bin1.hs b/third_party/bazel/rules_haskell/tests/binary-with-data/bin1.hs
deleted file mode 100644
index 309f6ecd5641..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-data/bin1.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-module Main where
-
-import Control.Monad (unless)
-
-main :: IO ()
-main = do
-    contents <- readFile "tests/binary-with-data/bin1-input"
-    unless (contents == "contents\n")
-      $ error $ "Incorrect input; got " ++ show contents
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-data/bin2.hs b/third_party/bazel/rules_haskell/tests/binary-with-data/bin2.hs
deleted file mode 100644
index 31d2404a6a9d..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-data/bin2.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module Main where
-
-import System.Process (callProcess)
-import System.Environment (getArgs)
-
-main = do
-  [arg] <- getArgs
-  callProcess arg []
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-import/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-import/BUILD.bazel
deleted file mode 100644
index 3b920d37c41a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-import/BUILD.bazel
+++ /dev/null
@@ -1,26 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "lib",
-    srcs = ["src/Lib.hs"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:transformers",
-    ],
-)
-
-haskell_test(
-    name = "binary-with-import",
-    srcs = ["Main.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-import/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-import/Main.hs
deleted file mode 100644
index 1bded5e8e55b..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-import/Main.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main where
-
-import Lib (printValue)
-
-main :: IO ()
-main = printValue
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-import/src/Lib.hs b/third_party/bazel/rules_haskell/tests/binary-with-import/src/Lib.hs
deleted file mode 100644
index d384e73e6337..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-import/src/Lib.hs
+++ /dev/null
@@ -1,13 +0,0 @@
-module Lib (printValue) where
-
-import Control.Monad (void)
-import Control.Monad.Trans.Class (lift)
-import Control.Monad.Trans.Except (ExceptT, runExceptT)
-
-getValue :: Monad m => ExceptT e m Int
-getValue = pure 42
-
-printValue :: IO ()
-printValue = void $ runExceptT $ do
-  value <- getValue
-  lift $ print value
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/BUILD.bazel
deleted file mode 100644
index 195288882b1a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/BUILD.bazel
+++ /dev/null
@@ -1,27 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "hs-lib",
-    srcs = ["HsLib.hs"],
-    tags = ["requires_zlib"],
-    deps = [
-        "//tests/hackage:base",
-        "@zlib.dev//:zlib",
-    ],
-)
-
-haskell_test(
-    name = "binary-with-indirect-sysdeps",
-    srcs = ["Main.hs"],
-    tags = ["requires_zlib"],
-    deps = [
-        ":hs-lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/HsLib.hs b/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/HsLib.hs
deleted file mode 100644
index 1077606e31e2..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/HsLib.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module HsLib where
-
-import Foreign.Ptr
-import Foreign.C.Types
-
-foreign import ccall crc32 :: CLong -> Ptr () -> CInt -> IO ()
-
-test = crc32 0 nullPtr 0
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/Main.hs
deleted file mode 100644
index 9c92b34c8a38..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-indirect-sysdeps/Main.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-module Main where
-
-import HsLib (test)
-
-main = test
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/BUILD.bazel
deleted file mode 100644
index 6be2db88b732..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/BUILD.bazel
+++ /dev/null
@@ -1,25 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "lib",
-    srcs = glob(["src/*.hs"]),
-    linkstatic = False,
-    src_strip_prefix = "src",
-)
-
-haskell_test(
-    name = "binary-with-lib-dynamic",
-    srcs = ["Main.hs"],
-    linkstatic = False,
-    visibility = ["//visibility:public"],
-    deps = [
-        ":lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/Main.hs
deleted file mode 100644
index d88f7c93d66a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/Main.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module Main where
-
-import Control.Monad (unless)
-import Lib           (value)
-
-main = unless (value == 42)
-    $ error $ "Incorrect lib value. Got " <> show value
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/src/Lib.hs b/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/src/Lib.hs
deleted file mode 100644
index 0521761f3572..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-lib-dynamic/src/Lib.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-{-# LANGUAGE NoImplicitPrelude #-}
-
-module Lib (value) where
-
-value = 42
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-lib/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-lib/BUILD.bazel
deleted file mode 100644
index 196d551305a9..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-lib/BUILD.bazel
+++ /dev/null
@@ -1,27 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "lib",
-    srcs = glob(["src/*.hs"]),
-    src_strip_prefix = "src",
-    deps = [
-        "//tests/hackage:template-haskell",
-    ],
-)
-
-haskell_test(
-    name = "binary-with-lib",
-    srcs = ["Main.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":lib",
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-lib/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-lib/Main.hs
deleted file mode 100644
index 19ad3dd58ea0..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-lib/Main.hs
+++ /dev/null
@@ -1,11 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-module Main where
-
-import Control.Monad (unless)
-import Lib           (value)
-import Language.Haskell.TH
-
-val = $(value)
-
-main = unless (val == 42)
-    $ error $ "Incorrect lib value. Got " <> show val
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-lib/src/Lib.hs b/third_party/bazel/rules_haskell/tests/binary-with-lib/src/Lib.hs
deleted file mode 100644
index e78d2ef77f1b..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-lib/src/Lib.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-{-# LANGUAGE NoImplicitPrelude #-}
-{-# LANGUAGE TemplateHaskell #-}
-
-module Lib (value) where
-
-import Language.Haskell.TH
-
-value = [|42|]
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-link-flags/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-link-flags/BUILD.bazel
deleted file mode 100644
index cf2aba515b69..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-link-flags/BUILD.bazel
+++ /dev/null
@@ -1,17 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(
-    default_testonly = 1,
-    default_visibility = ["//visibility:public"],
-)
-
-haskell_test(
-    name = "binary-with-link-flags",
-    srcs = ["Main.hs"],
-    compiler_flags = ["-threaded"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-link-flags/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-link-flags/Main.hs
deleted file mode 100644
index de106fe48f9a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-link-flags/Main.hs
+++ /dev/null
@@ -1,3 +0,0 @@
-module Main where
-
-main = return ()
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-main/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-main/BUILD.bazel
deleted file mode 100644
index e1243260c2ab..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-main/BUILD.bazel
+++ /dev/null
@@ -1,14 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "binary-with-main",
-    srcs = ["MainIsHere.hs"],
-    main_function = "MainIsHere.this",
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-main/MainIsHere.hs b/third_party/bazel/rules_haskell/tests/binary-with-main/MainIsHere.hs
deleted file mode 100644
index 5e8d38ba70df..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-main/MainIsHere.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module MainIsHere (this) where
-
-this :: IO ()
-this = return ()
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-plugin/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-plugin/BUILD.bazel
deleted file mode 100644
index f3a8e3f4d689..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-plugin/BUILD.bazel
+++ /dev/null
@@ -1,53 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "ghc_plugin",
-    "haskell_library",
-    "haskell_test",
-    "haskell_toolchain_library",
-)
-
-package(default_testonly = 1)
-
-config_setting(
-    name = "debug_build",
-    values = {
-        "compilation_mode": "dbg",
-    },
-)
-
-haskell_toolchain_library(name = "base")
-
-haskell_toolchain_library(name = "ghc")
-
-haskell_toolchain_library(name = "process")
-
-haskell_library(
-    name = "plugin-lib",
-    srcs = ["Plugin.hs"],
-    deps = [
-        ":base",
-        ":ghc",
-        ":process",
-    ],
-)
-
-ghc_plugin(
-    name = "plugin",
-    args = ["$(location //tests/binary-simple)"],
-    module = "Plugin",
-    tools = ["//tests/binary-simple"],
-    deps = [":plugin-lib"],
-)
-
-haskell_test(
-    name = "binary-with-plugin",
-    srcs = ["Main.hs"],
-    plugins = select({
-        # XXX If profiling is enabled, ignore the plugin because of
-        # https://gitlab.haskell.org/ghc/ghc/issues/14335.
-        ":debug_build": [],
-        "//conditions:default": [":plugin"],
-    }),
-    visibility = ["//visibility:public"],
-    deps = [":base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-plugin/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-plugin/Main.hs
deleted file mode 100644
index 2048dbdecd9a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-plugin/Main.hs
+++ /dev/null
@@ -1,3 +0,0 @@
-module Main where
-
-main = putStrLn "hello world"
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-plugin/Plugin.hs b/third_party/bazel/rules_haskell/tests/binary-with-plugin/Plugin.hs
deleted file mode 100644
index 3827bb799215..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-plugin/Plugin.hs
+++ /dev/null
@@ -1,15 +0,0 @@
-module Plugin (plugin) where
-
-import Control.Monad (when)
-import GhcPlugins
-import System.Process (readProcess)
-
-plugin :: Plugin
-plugin = defaultPlugin { installCoreToDos = install }
-
-install :: [CommandLineOption] -> [CoreToDo] -> CoreM [CoreToDo]
-install [arg] todo = do
-  when ('$' `elem` arg) $
-    fail "Make variable not expanded."
-  _ <- liftIO $ readProcess arg [] ""
-  return todo
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-prebuilt/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-prebuilt/BUILD.bazel
deleted file mode 100644
index 99a22ae9991f..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-prebuilt/BUILD.bazel
+++ /dev/null
@@ -1,19 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "binary-with-prebuilt",
-    srcs = ["Main.hs"],
-    tags = ["requires_hackage"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-        "@hackage//:streaming",
-        "@hackage//:void",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-prebuilt/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-prebuilt/Main.hs
deleted file mode 100644
index aa3b1b40ee8a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-prebuilt/Main.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main where
-
-import Data.List ()
-import Language.Haskell.TH ()
-
-main = return ()
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-sysdeps/BUILD.bazel b/third_party/bazel/rules_haskell/tests/binary-with-sysdeps/BUILD.bazel
deleted file mode 100644
index 769ecf31a38c..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-sysdeps/BUILD.bazel
+++ /dev/null
@@ -1,17 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "binary-with-sysdeps",
-    srcs = ["Main.hs"],
-    tags = ["requires_zlib"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "@zlib",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/binary-with-sysdeps/Main.hs b/third_party/bazel/rules_haskell/tests/binary-with-sysdeps/Main.hs
deleted file mode 100644
index bf8da504168a..000000000000
--- a/third_party/bazel/rules_haskell/tests/binary-with-sysdeps/Main.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module Main where
-
-import Foreign.Ptr
-import Foreign.C.Types
-
-foreign import ccall crc32 :: CLong -> Ptr () -> CInt -> IO ()
-
-main = crc32 0 nullPtr 0
diff --git a/third_party/bazel/rules_haskell/tests/c-compiles-still/BUILD.bazel b/third_party/bazel/rules_haskell/tests/c-compiles-still/BUILD.bazel
deleted file mode 100644
index 314b895b6be4..000000000000
--- a/third_party/bazel/rules_haskell/tests/c-compiles-still/BUILD.bazel
+++ /dev/null
@@ -1,15 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "foo",
-    srcs = ["Foo.hs"],
-    deps = [
-        "//tests/data:ourclibrary",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/c-compiles-still/Foo.hs b/third_party/bazel/rules_haskell/tests/c-compiles-still/Foo.hs
deleted file mode 100644
index f325b2efcfbb..000000000000
--- a/third_party/bazel/rules_haskell/tests/c-compiles-still/Foo.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Foo (foo) where
-
-foo :: Int
-foo = 5
diff --git a/third_party/bazel/rules_haskell/tests/c-compiles/BUILD.bazel b/third_party/bazel/rules_haskell/tests/c-compiles/BUILD.bazel
deleted file mode 100644
index b5256bfb18d0..000000000000
--- a/third_party/bazel/rules_haskell/tests/c-compiles/BUILD.bazel
+++ /dev/null
@@ -1,26 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "hs-lib",
-    srcs = ["Lib.hs"],
-    deps = [
-        "//tests/data:ourclibrary",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_test(
-    name = "c-compiles",
-    srcs = ["Main.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":hs-lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/c-compiles/Lib.hs b/third_party/bazel/rules_haskell/tests/c-compiles/Lib.hs
deleted file mode 100644
index 6ebec6b460ce..000000000000
--- a/third_party/bazel/rules_haskell/tests/c-compiles/Lib.hs
+++ /dev/null
@@ -1,10 +0,0 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
-module Lib (ten) where
-
-import Foreign.C.Types (CInt(..))
-
-foreign import ccall "c_add_one"
-  c_add_one :: CInt -> CInt
-
-ten :: Int
-ten = fromIntegral (c_add_one 9)
diff --git a/third_party/bazel/rules_haskell/tests/c-compiles/Main.hs b/third_party/bazel/rules_haskell/tests/c-compiles/Main.hs
deleted file mode 100644
index 5fc7b957c84b..000000000000
--- a/third_party/bazel/rules_haskell/tests/c-compiles/Main.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module Main (main) where
-
-import Control.Monad (unless)
-import Lib           (ten)
-
-main :: IO ()
-main = unless (ten == 10)
-    $ error $ "Incorrect lib value. Got " <> show ten
diff --git a/third_party/bazel/rules_haskell/tests/c-compiles/c-compiles.c b/third_party/bazel/rules_haskell/tests/c-compiles/c-compiles.c
deleted file mode 100644
index 2d3a4d742c30..000000000000
--- a/third_party/bazel/rules_haskell/tests/c-compiles/c-compiles.c
+++ /dev/null
@@ -1 +0,0 @@
-int add_five(int x) { return x + 5; }
diff --git a/third_party/bazel/rules_haskell/tests/c2hs/BUILD.bazel b/third_party/bazel/rules_haskell/tests/c2hs/BUILD.bazel
deleted file mode 100644
index a343c55f57fc..000000000000
--- a/third_party/bazel/rules_haskell/tests/c2hs/BUILD.bazel
+++ /dev/null
@@ -1,36 +0,0 @@
-load("@io_tweag_rules_haskell//haskell:c2hs.bzl", "c2hs_library")
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-c2hs_library(
-    name = "foo",
-    srcs = ["src/Foo/Foo.chs"],
-    src_strip_prefix = "src",
-    tags = [
-        "requires_c2hs",
-        "requires_zlib",
-    ],
-    deps = ["@zlib.dev//:zlib"],
-)
-
-c2hs_library(
-    name = "bar",
-    srcs = ["Bar.chs"],
-    tags = ["requires_c2hs"],
-    deps = [":foo"],
-)
-
-haskell_library(
-    name = "c2hs",
-    srcs = [
-        ":bar",
-        ":foo",
-        "@c2hs_repo//:baz",
-    ],
-    tags = ["requires_c2hs"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/c2hs/Bar.chs b/third_party/bazel/rules_haskell/tests/c2hs/Bar.chs
deleted file mode 100644
index 1de32c1ccb3b..000000000000
--- a/third_party/bazel/rules_haskell/tests/c2hs/Bar.chs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Bar (bar) where
-
-{#import Foo.Foo#}
-
-bar :: Int
-bar = 6
diff --git a/third_party/bazel/rules_haskell/tests/c2hs/repo/BUILD.bazel b/third_party/bazel/rules_haskell/tests/c2hs/repo/BUILD.bazel
deleted file mode 100644
index 4f1d15c09a6f..000000000000
--- a/third_party/bazel/rules_haskell/tests/c2hs/repo/BUILD.bazel
+++ /dev/null
@@ -1,10 +0,0 @@
-load("@io_tweag_rules_haskell//haskell:c2hs.bzl", "c2hs_library")
-
-package(default_testonly = 1)
-
-c2hs_library(
-    name = "baz",
-    srcs = ["Baz.chs"],
-    visibility = ["//visibility:public"],
-    deps = ["@zlib.dev//:zlib"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/c2hs/repo/Baz.chs b/third_party/bazel/rules_haskell/tests/c2hs/repo/Baz.chs
deleted file mode 100644
index b6d74dfc4ea8..000000000000
--- a/third_party/bazel/rules_haskell/tests/c2hs/repo/Baz.chs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Baz (baz) where
-
-#include <zlib.h>
-
-baz :: Int
-baz = {# sizeof gz_header_s #}
diff --git a/third_party/bazel/rules_haskell/tests/c2hs/repo/WORKSPACE b/third_party/bazel/rules_haskell/tests/c2hs/repo/WORKSPACE
deleted file mode 100644
index e53539f0b46c..000000000000
--- a/third_party/bazel/rules_haskell/tests/c2hs/repo/WORKSPACE
+++ /dev/null
@@ -1 +0,0 @@
-workspace(name = "c2hs_repo")
diff --git a/third_party/bazel/rules_haskell/tests/c2hs/src/Foo/Foo.chs b/third_party/bazel/rules_haskell/tests/c2hs/src/Foo/Foo.chs
deleted file mode 100644
index 244f3b2b29ff..000000000000
--- a/third_party/bazel/rules_haskell/tests/c2hs/src/Foo/Foo.chs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Foo.Foo (foo) where
-
-#include <zlib.h>
-
-foo :: Int
-foo = {# sizeof gz_header_s #}
diff --git a/third_party/bazel/rules_haskell/tests/cc_haskell_import/BUILD.bazel b/third_party/bazel/rules_haskell/tests/cc_haskell_import/BUILD.bazel
deleted file mode 100644
index c89631450059..000000000000
--- a/third_party/bazel/rules_haskell/tests/cc_haskell_import/BUILD.bazel
+++ /dev/null
@@ -1,70 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "hs-lib-a",
-    srcs = ["LibA.hs"],
-    deps = [
-        "//tests/data:ourclibrary",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_library(
-    name = "hs-lib-b",
-    srcs = ["LibB.hs"],
-    deps = [
-        ":hs-lib-a",
-        "//tests/hackage:base",
-    ],
-)
-
-cc_binary(
-    name = "cc-bin",
-    srcs = [
-        "main.c",
-    ],
-    # TODO support linking with static haskell libraries.
-    linkstatic = False,
-    tags = ["requires_threaded_rts"],
-    visibility = ["//tests:__subpackages__"],
-    deps = [
-        ":hs-lib-b",
-        "@ghc//:threaded-rts",
-    ],
-)
-
-# We go one step further and use the Haskell library from above
-# to build a static .so which is then loaded with a Python script
-# and calls the Haskell function constructed from GHC C FFI.
-
-# shared library which python will dlopen
-cc_binary(
-    name = "hs-lib-b-wrapped.so",
-    linkshared = 1,
-    linkstatic = 0,
-    tags = ["requires_threaded_rts"],
-    visibility = ["//tests:__subpackages__"],
-    deps = [
-        ":hs-lib-b",
-        "@ghc//:threaded-rts",
-    ],
-)
-
-# just dlopens hb-lib-b-wrapped.so and prints it
-py_binary(
-    name = "python_add_one",
-    srcs = ["python_add_one.py"],
-    data = [
-        ":hs-lib-b-wrapped.so",
-    ],
-    default_python_version = "PY3",
-    srcs_version = "PY3ONLY",
-    tags = ["requires_threaded_rts"],
-    visibility = ["//tests:__subpackages__"],
-    deps = ["@bazel_tools//tools/python/runfiles"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/cc_haskell_import/LibA.hs b/third_party/bazel/rules_haskell/tests/cc_haskell_import/LibA.hs
deleted file mode 100644
index db8e442e5a5f..000000000000
--- a/third_party/bazel/rules_haskell/tests/cc_haskell_import/LibA.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module LibA (add_one) where
-
-import Data.Int (Int32)
-
-foreign import ccall "c_add_one" c_add_one' :: Int32 -> Int32
-
-add_one :: Int32 -> Int32
-add_one x = c_add_one' x
diff --git a/third_party/bazel/rules_haskell/tests/cc_haskell_import/LibB.hs b/third_party/bazel/rules_haskell/tests/cc_haskell_import/LibB.hs
deleted file mode 100644
index 5904463b51fc..000000000000
--- a/third_party/bazel/rules_haskell/tests/cc_haskell_import/LibB.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-module LibB (add_one_hs) where
-
-import LibA (add_one)
-import Data.Int (Int32)
-
-foreign export ccall add_one_hs :: Int32 -> IO Int32
-
-add_one_hs :: Int32 -> IO Int32
-add_one_hs x = pure $! add_one x + 0
diff --git a/third_party/bazel/rules_haskell/tests/cc_haskell_import/cbits.c b/third_party/bazel/rules_haskell/tests/cc_haskell_import/cbits.c
deleted file mode 100644
index 587d26ba28aa..000000000000
--- a/third_party/bazel/rules_haskell/tests/cc_haskell_import/cbits.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include <stdint.h>
-
-int32_t c_add_one(int32_t x) {
-  return 1 + x;
-}
diff --git a/third_party/bazel/rules_haskell/tests/cc_haskell_import/main.c b/third_party/bazel/rules_haskell/tests/cc_haskell_import/main.c
deleted file mode 100644
index 661174e5df49..000000000000
--- a/third_party/bazel/rules_haskell/tests/cc_haskell_import/main.c
+++ /dev/null
@@ -1,11 +0,0 @@
-#include <stdio.h>
-#include "HsFFI.h"
-
-extern HsInt32 add_one_hs(HsInt32 a0);
-
-int main(int argc, char *argv[]) {
-  hs_init(&argc, &argv);
-  printf("Adding one to 5 through Haskell is %d\n", add_one_hs(5));
-  hs_exit();
-  return 0;
-}
diff --git a/third_party/bazel/rules_haskell/tests/cc_haskell_import/python_add_one.py b/third_party/bazel/rules_haskell/tests/cc_haskell_import/python_add_one.py
deleted file mode 100644
index b400102d1cc6..000000000000
--- a/third_party/bazel/rules_haskell/tests/cc_haskell_import/python_add_one.py
+++ /dev/null
@@ -1,18 +0,0 @@
-import os
-import ctypes
-from bazel_tools.tools.python.runfiles import runfiles
-import subprocess
-
-r = runfiles.Create()
-
-path = r.Rlocation('io_tweag_rules_haskell/tests/cc_haskell_import/hs-lib-b-wrapped.so')
-
-foreignlib = ctypes.cdll.LoadLibrary(path)
-
-# ATTN: If you remove this print *statement* hs_init will segfault!
-# If you use the python3 print *function*, it will segfault as well!
-# TODO: wtf?
-print foreignlib
-
-foreignlib.hs_init()
-assert(str(foreignlib.add_one_hs(1)) == "2")
diff --git a/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/BUILD.bazel b/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/BUILD.bazel
deleted file mode 100644
index af8848a6eea7..000000000000
--- a/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/BUILD.bazel
+++ /dev/null
@@ -1,36 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-# empty library with package name "bytestring"
-haskell_library(
-    name = "bytestring",
-    srcs = ["src/BS.hs"],
-    deps = ["//tests/hackage:base"],
-)
-
-# This depends on two packages "bytestring"
-# There should be no CPP macro conflict
-haskell_test(
-    name = "macro_conflict",
-    srcs = ["Main.hs"],
-    compiler_flags = [
-        "-XCPP",
-        "-Werror",
-    ] + select({
-        # clang on darwin fails because of unused command line argument, it fails because of -Werror
-        "@bazel_tools//src/conditions:darwin": [
-            "-optP-Wno-unused-command-line-argument",
-        ],
-        "//conditions:default": [],
-    }),
-    deps = [
-        ":bytestring",
-        "//tests/hackage:base",
-        "//tests/hackage:bytestring",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/Main.hs b/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/Main.hs
deleted file mode 100644
index f5a27e6a7efb..000000000000
--- a/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/Main.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-import qualified Data.ByteString
-import BS
-
-main = putStrLn "hello"
diff --git a/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/src/BS.hs b/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/src/BS.hs
deleted file mode 100644
index 437b7e5f72cd..000000000000
--- a/third_party/bazel/rules_haskell/tests/cpp_macro_conflict/src/BS.hs
+++ /dev/null
@@ -1 +0,0 @@
-module BS where
diff --git a/third_party/bazel/rules_haskell/tests/data/BUILD.bazel b/third_party/bazel/rules_haskell/tests/data/BUILD.bazel
deleted file mode 100644
index 7083de23af40..000000000000
--- a/third_party/bazel/rules_haskell/tests/data/BUILD.bazel
+++ /dev/null
@@ -1,15 +0,0 @@
-# Generic data files and targets that are used by multiple tests
-
-cc_library(
-    name = "ourclibrary",
-    srcs = [":ourclibrary.c"],
-    linkstatic = False,
-    visibility = ["//visibility:public"],
-)
-
-cc_library(
-    name = "ourclibrary-static",
-    srcs = [":ourclibrary.c"],
-    linkstatic = True,
-    visibility = ["//visibility:public"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/data/ourclibrary.c b/third_party/bazel/rules_haskell/tests/data/ourclibrary.c
deleted file mode 100644
index 587d26ba28aa..000000000000
--- a/third_party/bazel/rules_haskell/tests/data/ourclibrary.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include <stdint.h>
-
-int32_t c_add_one(int32_t x) {
-  return 1 + x;
-}
diff --git a/third_party/bazel/rules_haskell/tests/encoding/BUILD.bazel b/third_party/bazel/rules_haskell/tests/encoding/BUILD.bazel
deleted file mode 100644
index 588d13f6d0b7..000000000000
--- a/third_party/bazel/rules_haskell/tests/encoding/BUILD.bazel
+++ /dev/null
@@ -1,21 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "encoding",
-    srcs = [
-        "Main.hs",
-        "TH.hs",
-    ],
-    extra_srcs = [
-        "unicode.txt",
-    ],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/encoding/Main.hs b/third_party/bazel/rules_haskell/tests/encoding/Main.hs
deleted file mode 100644
index beb5f2a29497..000000000000
--- a/third_party/bazel/rules_haskell/tests/encoding/Main.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-
-module Main (main) where
-
-import TH
-
-main :: IO ()
-main = putStrLn $foo
diff --git a/third_party/bazel/rules_haskell/tests/encoding/TH.hs b/third_party/bazel/rules_haskell/tests/encoding/TH.hs
deleted file mode 100644
index 8cb52b3f1139..000000000000
--- a/third_party/bazel/rules_haskell/tests/encoding/TH.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module TH (foo) where
-
-import Language.Haskell.TH
-import Language.Haskell.TH.Syntax (lift)
-
-foo :: Q Exp
-foo = runIO (readFile "tests/encoding/unicode.txt") >>= lift
diff --git a/third_party/bazel/rules_haskell/tests/encoding/unicode.txt b/third_party/bazel/rules_haskell/tests/encoding/unicode.txt
deleted file mode 100644
index 74e5f2638d08..000000000000
--- a/third_party/bazel/rules_haskell/tests/encoding/unicode.txt
+++ /dev/null
@@ -1 +0,0 @@
-Некоторый текст на русском.
diff --git a/third_party/bazel/rules_haskell/tests/external-haskell-repository/BUILD.bazel b/third_party/bazel/rules_haskell/tests/external-haskell-repository/BUILD.bazel
deleted file mode 100644
index 30ff35704050..000000000000
--- a/third_party/bazel/rules_haskell/tests/external-haskell-repository/BUILD.bazel
+++ /dev/null
@@ -1,17 +0,0 @@
-# Tests correct linking of haskell packages that were created
-# in a different bazel repository, e.g. with hazel.
-
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-haskell_test(
-    name = "external-haskell-repository",
-    srcs = ["Main.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "@haskell_package_repository_dummy//:library-with-cbits",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/external-haskell-repository/Main.hs b/third_party/bazel/rules_haskell/tests/external-haskell-repository/Main.hs
deleted file mode 100644
index 97fcc158880a..000000000000
--- a/third_party/bazel/rules_haskell/tests/external-haskell-repository/Main.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main where
-
-import AddOne
-import Control.Exception (assert)
-
-main = assert (addOne 41 == 42) $ return ()
diff --git a/third_party/bazel/rules_haskell/tests/external-haskell-repository/workspace_dummy.bzl b/third_party/bazel/rules_haskell/tests/external-haskell-repository/workspace_dummy.bzl
deleted file mode 100644
index 1ccc0aadf1de..000000000000
--- a/third_party/bazel/rules_haskell/tests/external-haskell-repository/workspace_dummy.bzl
+++ /dev/null
@@ -1,64 +0,0 @@
-# This file constructs a dummy workspace to test
-# haskell binaries that are included from outside repositories
-# (because linking external repositories works differently).
-
-# Repo-ception, in the sense that we build a WORKSPACE
-# that references the workspaces already set up in the
-# `rules_haskell` WORKSPACE.
-def _haskell_package_repository_dummy_impl(rep_ctx):
-    rep_ctx.file(
-        "WORKSPACE",
-        executable = False,
-        content = """
-repository(name={name})
-
-register_toolchains(
-  "@io_tweag_rules_haskell//tests/:ghc"
-)
-""".format(name = rep_ctx.name),
-    )
-
-    # this mirrors tests/library-with-cbits
-
-    rep_ctx.file(
-        "BUILD",
-        executable = False,
-        content = """
-load(
-  "@io_tweag_rules_haskell//haskell:haskell.bzl",
-  "haskell_toolchain",
-  "haskell_library",
-)
-load(
-  "@io_tweag_rules_haskell//:constants.bzl",
-  "test_ghc_version",
-)
-
-haskell_library(
-  name = "library-with-cbits",
-  srcs = ["AddOne.hs"],
-  deps = [
-      "@io_tweag_rules_haskell//tests/data:ourclibrary",
-      "@io_tweag_rules_haskell//tests/hackage:base",
-  ],
-
-  linkstatic = False,
-  visibility = ["//visibility:public"],
-)
-""",
-    )
-
-    rep_ctx.file(
-        "AddOne.hs",
-        executable = False,
-        content = """
-module AddOne where
-
-foreign import ccall "c_add_one" addOne :: Int -> Int
-""",
-    )
-
-haskell_package_repository_dummy = repository_rule(
-    _haskell_package_repository_dummy_impl,
-    local = True,
-)
diff --git a/third_party/bazel/rules_haskell/tests/extra-source-files/BUILD.bazel b/third_party/bazel/rules_haskell/tests/extra-source-files/BUILD.bazel
deleted file mode 100644
index 9552d7c9e974..000000000000
--- a/third_party/bazel/rules_haskell/tests/extra-source-files/BUILD.bazel
+++ /dev/null
@@ -1,44 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "extra-source-files",
-    srcs = [
-        "Foo.hs",
-        "FooTH.hs",
-    ],
-    # Test that the linker can also see the extra_srcs.
-    compiler_flags = ["-optl-Wl,@tests/extra-source-files/ld-options.txt"],
-    extra_srcs = [
-        "file.txt",
-        "ld-options.txt",
-    ],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-    ],
-)
-
-haskell_test(
-    name = "extra-source-files-bin",
-    srcs = [
-        "Foo.hs",
-        "FooTH.hs",
-        "Main.hs",
-    ],
-    # Test that the linker can also see the extra_srcs.
-    compiler_flags = ["-optl-Wl,@tests/extra-source-files/ld-options.txt"],
-    extra_srcs = [
-        "file.txt",
-        "ld-options.txt",
-    ],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/extra-source-files/Foo.hs b/third_party/bazel/rules_haskell/tests/extra-source-files/Foo.hs
deleted file mode 100644
index b3f0c04492db..000000000000
--- a/third_party/bazel/rules_haskell/tests/extra-source-files/Foo.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-
-module Foo (foo) where
-
-import FooTH (embedFile)
-
-foo :: String
-foo = $(embedFile "tests/extra-source-files/file.txt") ++ "!"
diff --git a/third_party/bazel/rules_haskell/tests/extra-source-files/FooTH.hs b/third_party/bazel/rules_haskell/tests/extra-source-files/FooTH.hs
deleted file mode 100644
index 24d663108355..000000000000
--- a/third_party/bazel/rules_haskell/tests/extra-source-files/FooTH.hs
+++ /dev/null
@@ -1,12 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-
-module FooTH (embedFile) where
-
-import Language.Haskell.TH
-import Language.Haskell.TH.Syntax
-
-embedFile :: FilePath -> Q Exp
-embedFile path = do
-  str <- runIO (readFile path)
-  addDependentFile path
-  [| str |]
diff --git a/third_party/bazel/rules_haskell/tests/extra-source-files/Main.hs b/third_party/bazel/rules_haskell/tests/extra-source-files/Main.hs
deleted file mode 100644
index 13e4bd765b6a..000000000000
--- a/third_party/bazel/rules_haskell/tests/extra-source-files/Main.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-import Foo (foo)
-
-main :: IO ()
-main = putStrLn foo
diff --git a/third_party/bazel/rules_haskell/tests/extra-source-files/file.txt b/third_party/bazel/rules_haskell/tests/extra-source-files/file.txt
deleted file mode 100644
index 5bc133a4d007..000000000000
--- a/third_party/bazel/rules_haskell/tests/extra-source-files/file.txt
+++ /dev/null
@@ -1 +0,0 @@
-And here we go
diff --git a/third_party/bazel/rules_haskell/tests/extra-source-files/ld-options.txt b/third_party/bazel/rules_haskell/tests/extra-source-files/ld-options.txt
deleted file mode 100644
index e69de29bb2d1..000000000000
--- a/third_party/bazel/rules_haskell/tests/extra-source-files/ld-options.txt
+++ /dev/null
diff --git a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/BUILD.bazel b/third_party/bazel/rules_haskell/tests/failures/transitive-deps/BUILD.bazel
deleted file mode 100644
index c2efbd924a32..000000000000
--- a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/BUILD.bazel
+++ /dev/null
@@ -1,66 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "lib-a",
-    srcs = ["LibA.hs"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_library(
-    name = "lib-b",
-    srcs = ["LibB.hs"],
-    visibility = ["//visibility:private"],
-    deps = [
-        ":lib-a",
-        "//tests/hackage:base",
-    ],
-)
-
-# Targets that must FAIL. These are tagged as manual so that
-#
-# $ bazel build //...
-#
-# does not fail.
-
-haskell_library(
-    # Should fail because it doesn't specify "base" explicitly.
-    name = "lib-cFailure",
-    srcs = ["LibC.hs"],
-    tags = ["manual"],
-    deps = [":lib-b"],
-)
-
-haskell_library(
-    name = "lib-c",
-    srcs = ["LibC.hs"],
-    deps = [
-        ":lib-b",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_library(
-    # Should fail because it doesn't specify "lib-a" explicitly.
-    name = "lib-dFailure",
-    srcs = ["LibD.hs"],
-    tags = ["manual"],
-    deps = [
-        ":lib-b",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_library(
-    name = "lib-d",
-    srcs = ["LibD.hs"],
-    deps = [
-        ":lib-a",
-        ":lib-b",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibA.hs b/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibA.hs
deleted file mode 100644
index 23e9486489fe..000000000000
--- a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibA.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module LibA (thingA) where
-
-thingA :: Int
-thingA = 5
diff --git a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibB.hs b/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibB.hs
deleted file mode 100644
index 9ab883093bd8..000000000000
--- a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibB.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module LibB (thingB) where
-
-import LibA (thingA)
-
-thingB :: Int
-thingB = thingA + 1
diff --git a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibC.hs b/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibC.hs
deleted file mode 100644
index 70514f13168b..000000000000
--- a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibC.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module LibC (thingC) where
-
-import LibB (thingB)
-
-thingC :: Int
-thingC = thingB * 2
diff --git a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibD.hs b/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibD.hs
deleted file mode 100644
index 326d224a2a15..000000000000
--- a/third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibD.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module LibD (thingD) where
-
-import LibA (thingA)
-import LibB (thingB)
-
-thingD :: Int
-thingD = thingA + thingB
diff --git a/third_party/bazel/rules_haskell/tests/generated-modules/BUILD.bazel b/third_party/bazel/rules_haskell/tests/generated-modules/BUILD.bazel
deleted file mode 100644
index 098c7148a960..000000000000
--- a/third_party/bazel/rules_haskell/tests/generated-modules/BUILD.bazel
+++ /dev/null
@@ -1,56 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(
-    default_testonly = 1,
-    default_visibility = ["//visibility:public"],
-)
-
-genrule(
-    name = "generate-genmodule",
-    outs = ["src/GenModule.hs"],
-    cmd = "printf 'module GenModule where\na = 1 :: Int' > $@",
-)
-
-haskell_library(
-    name = "GenModule",
-    srcs = [":generate-genmodule"],
-    src_strip_prefix = "src",
-    deps = ["//tests/hackage:base"],
-)
-
-genrule(
-    name = "generate-binmodule",
-    outs = ["src/BinModule.hs"],
-    cmd = "printf 'module BinModule where\nb = 2 :: Int' > $@",
-    output_to_bindir = 1,
-)
-
-haskell_library(
-    name = "BinModule",
-    srcs = [":generate-binmodule"],
-    src_strip_prefix = "src",
-    deps = ["//tests/hackage:base"],
-)
-
-genrule(
-    name = "generate-main",
-    outs = ["src/Main.hs"],
-    cmd = "printf 'module Main where\nimport GenModule\nimport BinModule\n" +
-          "main = print (a+b) :: IO ()' > $@",
-)
-
-haskell_test(
-    name = "generated-modules",
-    size = "small",
-    srcs = [":generate-main"],
-    src_strip_prefix = "src",
-    deps = [
-        ":BinModule",
-        ":GenModule",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/ghc.nix b/third_party/bazel/rules_haskell/tests/ghc.nix
deleted file mode 100644
index cde1699918f2..000000000000
--- a/third_party/bazel/rules_haskell/tests/ghc.nix
+++ /dev/null
@@ -1,41 +0,0 @@
-{ pkgs ? import ../nixpkgs {}
-# Whether we want to wrap the packages using <bazel_haskell_wrapper>.
-# When this is called from inside bazel, we need to wrap the haskell package
-# set using <bazel_haskell_wrapper>. Otherwise we don't need (and don't want)
-# to.
-, wrapPackages ? (builtins.tryEval <bazel_haskell_wrapper>).success
-}:
-
-with pkgs;
-
-let haskellPackages = pkgs.haskell.packages.ghc864.override {
-      overrides = with pkgs.haskell.lib; self: super: rec {
-        libc = import ./haddock/libC.nix self pkgs;
-      };
-    };
-    genBazelBuild =
-      if wrapPackages
-      then callPackage <bazel_haskell_wrapper> {}
-      else (x: x);
-
-in
-  {
-  ghc = haskellPackages.ghcWithPackages (p: with p; [
-
-    # haskell_proto_library inputs
-    bytestring
-    containers
-    data-default-class
-    lens-family
-    lens-labels
-    proto-lens
-    text
-
-  # test inputs
-  libc
-
-  # for test runner
-  hspec
-  ]);
-  haskellPackages = genBazelBuild haskellPackages;
-}
diff --git a/third_party/bazel/rules_haskell/tests/ghc/BUILD.bazel b/third_party/bazel/rules_haskell/tests/ghc/BUILD.bazel
deleted file mode 100644
index 345ce4badf91..000000000000
--- a/third_party/bazel/rules_haskell/tests/ghc/BUILD.bazel
+++ /dev/null
@@ -1,3 +0,0 @@
-load("//tests/ghc:ghc.bzl", "ghc_help")
-
-ghc_help(name = "ghc_help")
diff --git a/third_party/bazel/rules_haskell/tests/ghc/ghc.bzl b/third_party/bazel/rules_haskell/tests/ghc/ghc.bzl
deleted file mode 100644
index 443f04e7be63..000000000000
--- a/third_party/bazel/rules_haskell/tests/ghc/ghc.bzl
+++ /dev/null
@@ -1,19 +0,0 @@
-"""Runs ghc --help"""
-
-hs_toolchain = "@io_tweag_rules_haskell//haskell:toolchain"
-
-def _impl(ctx):
-    output = ctx.outputs.out
-    ghc = ctx.toolchains[hs_toolchain].tools.ghc
-    ctx.actions.run_shell(
-        inputs = [ghc],
-        outputs = [output],
-        progress_message = "Printing ghc help message",
-        command = "%s --help > %s" % (ghc.path, output.path),
-    )
-
-ghc_help = rule(
-    implementation = _impl,
-    outputs = {"out": "out_file"},
-    toolchains = [hs_toolchain],
-)
diff --git a/third_party/bazel/rules_haskell/tests/hackage/BUILD.bazel b/third_party/bazel/rules_haskell/tests/hackage/BUILD.bazel
deleted file mode 100644
index 63fb6f941b4b..000000000000
--- a/third_party/bazel/rules_haskell/tests/hackage/BUILD.bazel
+++ /dev/null
@@ -1,34 +0,0 @@
-"""
-    Fetches GHC boot packages from GHC directly rather than from Nixpkgs
-    for better bindist support.
-"""
-
-package(default_visibility = [
-    "//tests:__subpackages__",
-    "@haskell_package_repository_dummy//:__subpackages__",
-])
-
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_toolchain_library",
-)
-
-[
-    haskell_toolchain_library(name = name)
-    for name in [
-        "array",
-        "base",
-        "binary",
-        "bytestring",
-        "containers",
-        "deepseq",
-        "directory",
-        "filepath",
-        "mtl",
-        "template-haskell",
-        "transformers",
-        "ghc-prim",
-        "process",
-        "text",
-    ]
-]
diff --git a/third_party/bazel/rules_haskell/tests/haddock/BUILD.bazel b/third_party/bazel/rules_haskell/tests/haddock/BUILD.bazel
deleted file mode 100644
index 6955285c87d2..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/BUILD.bazel
+++ /dev/null
@@ -1,73 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_doc",
-    "haskell_library",
-    "haskell_toolchain_library",
-)
-
-package(
-    default_testonly = 1,
-    default_visibility = ["//visibility:public"],
-)
-
-haskell_library(
-    name = "haddock-lib-deep",
-    srcs = ["Deep.hsc"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_library(
-    name = "haddock-lib-a",
-    srcs = [
-        "LibA.hs",
-        "LibA/A.hs",
-        "header.h",
-    ],
-    compiler_flags = ["-I."],
-    deps = [
-        ":haddock-lib-deep",
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-    ],
-)
-
-haskell_toolchain_library(
-    name = "haddock-lib-c",
-    package = "libc",
-)
-
-haskell_library(
-    name = "haddock-lib-b",
-    srcs = [
-        "LibB.hs",
-        "TH.hs",
-    ],
-    extra_srcs = [
-        "unicode.txt",
-    ],
-    tags = [
-        "requires_hackage",
-        "requires_zlib",
-    ],
-    deps = [
-        ":haddock-lib-a",
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-        "@hackage//:libc",
-        "@zlib",
-    ],
-)
-
-haskell_doc(
-    name = "haddock",
-    index_transitive_deps = False,
-    tags = ["requires_hackage"],
-    deps = [":haddock-lib-b"],
-)
-
-haskell_doc(
-    name = "haddock-transitive",
-    index_transitive_deps = True,
-    tags = ["requires_hackage"],
-    deps = [":haddock-lib-b"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/haddock/Deep.hsc b/third_party/bazel/rules_haskell/tests/haddock/Deep.hsc
deleted file mode 100644
index 6fb0482a1572..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/Deep.hsc
+++ /dev/null
@@ -1,11 +0,0 @@
--- | "Deep" doc.
-module Deep (deep_lib) where
-
--- | 'deep_lib' doc.
-
-#if __GLASGOW_HASKELL__ >= 700
-#ifndef _INTERNAL_HSC_DO_NOT_DEFINE_ME
-deep_lib :: Int
-deep_lib = 100
-#endif
-#endif
diff --git a/third_party/bazel/rules_haskell/tests/haddock/LibA.hs b/third_party/bazel/rules_haskell/tests/haddock/LibA.hs
deleted file mode 100644
index 252c90ccc6d9..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/LibA.hs
+++ /dev/null
@@ -1,19 +0,0 @@
--- | "LibA" header
-{-# LANGUAGE CPP             #-}
-{-# LANGUAGE TemplateHaskell #-}
-
-#include "header.h"
-
-module LibA where
-
-import LibA.A (a)
-import Deep (deep_lib)
-
--- | 'A' declaration.
-data A =
-  -- | 'A' constructor.
-  A
-
--- | Doc for 'f' using 'a' and 'deep_lib'.
-f :: Int
-f = const $a deep_lib + MAGIC_NUMBER
diff --git a/third_party/bazel/rules_haskell/tests/haddock/LibA/A.hs b/third_party/bazel/rules_haskell/tests/haddock/LibA/A.hs
deleted file mode 100644
index 3be8dd5aadd3..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/LibA/A.hs
+++ /dev/null
@@ -1,10 +0,0 @@
--- | "LibA.A" header
-{-# LANGUAGE TemplateHaskell #-}
-
-module LibA.A where
-
-import Language.Haskell.TH
-
--- | 'a' doc
-a :: Q Exp
-a = [| 5 |]
diff --git a/third_party/bazel/rules_haskell/tests/haddock/LibB.hs b/third_party/bazel/rules_haskell/tests/haddock/LibB.hs
deleted file mode 100644
index b4df1ffcb9a2..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/LibB.hs
+++ /dev/null
@@ -1,21 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
--- | "LibB" doc.
-
-module LibB where
-
-import LibA.A (a)
-import LibA (f)
-import LibC (mytype, LibCType)
-import TH (foo)
-
--- | Doc for 'x' using 'f' and 'a' and 'Int'.
-x :: Int
-x = const f a
-
--- | This uses a type from an undocumented package
-y :: LibCType
-y = mytype
-
--- | A thing generated with TH.
-z :: String
-z = $foo
diff --git a/third_party/bazel/rules_haskell/tests/haddock/TH.hs b/third_party/bazel/rules_haskell/tests/haddock/TH.hs
deleted file mode 100644
index 6e791b09154e..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/TH.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module TH (foo) where
-
-import Language.Haskell.TH
-import Language.Haskell.TH.Syntax (lift)
-
-foo :: Q Exp
-foo = runIO (readFile "tests/haddock/unicode.txt") >>= lift
diff --git a/third_party/bazel/rules_haskell/tests/haddock/header.h b/third_party/bazel/rules_haskell/tests/haddock/header.h
deleted file mode 100644
index ec5eddd2766e..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/header.h
+++ /dev/null
@@ -1 +0,0 @@
-#define MAGIC_NUMBER 100
diff --git a/third_party/bazel/rules_haskell/tests/haddock/libC.nix b/third_party/bazel/rules_haskell/tests/haddock/libC.nix
deleted file mode 100644
index d345178838f1..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/libC.nix
+++ /dev/null
@@ -1,47 +0,0 @@
-# A trivial `haskellPackages` library that has haddock generation disabled
-self: pkgs:
-let
-  # pkgs = import ../../nixpkgs.nix {};
-
-  libC = pkgs.writeText "LibC.hs" ''
-    {-# language NoImplicitPrelude #-}
-    module LibC where
-
-    data LibCType = LibCType
-
-    -- | myfunction
-    mytype :: LibCType
-    mytype = LibCType
-  '';
-
-  cabal = pkgs.writeText "libc.cabal" ''
-    name: libc
-    version: 0.1.0.0
-    build-type: Simple
-    cabal-version: >=1.10
-
-    library
-      default-language: Haskell2010
-      exposed-modules: LibC
-   '';
-
-   src = pkgs.runCommand "libc-src" {} ''
-     mkdir $out
-     cp ${libC} $out/LibC.hs
-     cp ${cabal} $out/libc.cabal
-   '';
-
-in
-  # This call means the `.haddock` file is not generated,
-  # even though the ghc package still references the location
-  # where it would ordinarily be.
-  pkgs.haskell.lib.dontHaddock
-
-    (self.callPackage
-      ({ mkDerivation }: mkDerivation {
-        pname = "libc";
-        version = "0.1.0.0";
-        src = src;
-        license = pkgs.lib.licenses.mit;
-        isExecutable = false;
-      }) {})
diff --git a/third_party/bazel/rules_haskell/tests/haddock/unicode.txt b/third_party/bazel/rules_haskell/tests/haddock/unicode.txt
deleted file mode 100644
index 74e5f2638d08..000000000000
--- a/third_party/bazel/rules_haskell/tests/haddock/unicode.txt
+++ /dev/null
@@ -1 +0,0 @@
-Некоторый текст на русском.
diff --git a/third_party/bazel/rules_haskell/tests/haskell_doctest/BUILD.bazel b/third_party/bazel/rules_haskell/tests/haskell_doctest/BUILD.bazel
deleted file mode 100644
index c1d4e527aefc..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_doctest/BUILD.bazel
+++ /dev/null
@@ -1,73 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_doctest",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "lib-a",
-    srcs = ["Foo.hs"],
-    tags = ["requires_zlib"],
-    deps = [
-        "//tests/data:ourclibrary",
-        "//tests/hackage:base",
-        "@zlib.dev//:zlib",
-    ],
-)
-
-haskell_library(
-    name = "lib-b",
-    srcs = [
-        "Bar.hs",
-        "Baz.hs",
-        "Quux.hsc",
-    ],
-    tags = ["requires_zlib"],
-    deps = [
-        ":lib-a",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_doctest(
-    name = "doctest-lib-all-fail",
-    tags = ["manual"],  # must FAIL
-    visibility = ["//visibility:public"],
-    deps = [":lib-b"],
-)
-
-haskell_doctest(
-    name = "doctest-lib-all-success",
-    doctest_flags = ["-DMAGIC_DOCTEST_THING"],
-    tags = ["requires_doctest"],
-    visibility = ["//visibility:public"],
-    deps = [":lib-b"],
-)
-
-haskell_doctest(
-    name = "doctest-lib",
-    modules = ["Bar"],  # exclude Baz and succeed
-    tags = ["requires_doctest"],
-    visibility = ["//visibility:public"],
-    deps = [":lib-b"],
-)
-
-haskell_test(
-    name = "bin",
-    srcs = ["Main.hs"],
-    tags = ["requires_zlib"],
-    deps = [
-        ":lib-a",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_doctest(
-    name = "doctest-bin",
-    tags = ["requires_doctest"],
-    visibility = ["//visibility:public"],
-    deps = [":bin"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/haskell_doctest/Bar.hs b/third_party/bazel/rules_haskell/tests/haskell_doctest/Bar.hs
deleted file mode 100644
index cd82351855c3..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_doctest/Bar.hs
+++ /dev/null
@@ -1,13 +0,0 @@
-module Bar (bar) where
-
-import Foo (foo)
-import Numeric
-
--- |
--- >>> bar
--- 9
--- >>> showInt bar "" ++ "!"
--- "9!"
-
-bar :: Int
-bar = 4 + foo
diff --git a/third_party/bazel/rules_haskell/tests/haskell_doctest/Baz.hs b/third_party/bazel/rules_haskell/tests/haskell_doctest/Baz.hs
deleted file mode 100644
index d576235bf488..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_doctest/Baz.hs
+++ /dev/null
@@ -1,14 +0,0 @@
-{-# LANGUAGE CPP #-}
-
-module Baz (baz) where
-
--- |
--- >>> baz
--- 101
-
-baz :: Int
-#ifndef MAGIC_DOCTEST_THING
-baz = 100
-#else
-baz = 101
-#endif
diff --git a/third_party/bazel/rules_haskell/tests/haskell_doctest/Foo.hs b/third_party/bazel/rules_haskell/tests/haskell_doctest/Foo.hs
deleted file mode 100644
index d2c97b77aeb3..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_doctest/Foo.hs
+++ /dev/null
@@ -1,14 +0,0 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
-
-module Foo (foo) where
-
-import Foreign.C.Types (CInt(..))
-
-foreign import ccall "c_add_one"
-  c_add_one :: CInt -> CInt
-
--- |
--- >>> foo
--- 5
-foo :: Int
-foo = fromIntegral (c_add_one 4)
diff --git a/third_party/bazel/rules_haskell/tests/haskell_doctest/Main.hs b/third_party/bazel/rules_haskell/tests/haskell_doctest/Main.hs
deleted file mode 100644
index 1bc6f8abc905..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_doctest/Main.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main (main) where
-
-import Foo (foo)
-
-main :: IO ()
-main = print foo
diff --git a/third_party/bazel/rules_haskell/tests/haskell_doctest/Quux.hsc b/third_party/bazel/rules_haskell/tests/haskell_doctest/Quux.hsc
deleted file mode 100644
index 3d437274c9aa..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_doctest/Quux.hsc
+++ /dev/null
@@ -1,11 +0,0 @@
--- | This module is in a .hsc file, this way we test that improt directories
--- are passed correctly to the doctest executable.
-
-module Quux (quux) where
-
--- |
--- >>> quux
--- 68
-
-quux :: Int
-quux = 68
diff --git a/third_party/bazel/rules_haskell/tests/haskell_lint/BUILD.bazel b/third_party/bazel/rules_haskell/tests/haskell_lint/BUILD.bazel
deleted file mode 100644
index 702dfdfe07bc..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_lint/BUILD.bazel
+++ /dev/null
@@ -1,47 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_lint",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "lib-a",
-    srcs = ["Foo.hs"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_library(
-    name = "lib-b",
-    srcs = ["Bar.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":lib-a",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_lint(
-    name = "lint-lib-b",
-    visibility = ["//visibility:public"],
-    deps = [":lib-b"],
-)
-
-haskell_test(
-    name = "bin",
-    srcs = ["Main.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":lib-a",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_lint(
-    name = "lint-bin",
-    visibility = ["//visibility:public"],
-    deps = [":bin"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/haskell_lint/Bar.hs b/third_party/bazel/rules_haskell/tests/haskell_lint/Bar.hs
deleted file mode 100644
index 18e9583e5ad6..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_lint/Bar.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Bar (bar) where
-
-import Foo (foo)
-
-bar :: Int
-bar = 4 + foo :: Int
diff --git a/third_party/bazel/rules_haskell/tests/haskell_lint/Foo.hs b/third_party/bazel/rules_haskell/tests/haskell_lint/Foo.hs
deleted file mode 100644
index 119192e6b12b..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_lint/Foo.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Foo (foo) where
-
-foo :: Int
-foo = 5 :: Int
diff --git a/third_party/bazel/rules_haskell/tests/haskell_lint/Main.hs b/third_party/bazel/rules_haskell/tests/haskell_lint/Main.hs
deleted file mode 100644
index 1bc6f8abc905..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_lint/Main.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main (main) where
-
-import Foo (foo)
-
-main :: IO ()
-main = print foo
diff --git a/third_party/bazel/rules_haskell/tests/haskell_proto_library/BUILD.bazel b/third_party/bazel/rules_haskell/tests/haskell_proto_library/BUILD.bazel
deleted file mode 100644
index f5f8762b3aff..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_proto_library/BUILD.bazel
+++ /dev/null
@@ -1,78 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_doc",
-    "haskell_library",
-    "haskell_proto_library",
-)
-
-package(default_testonly = 1)
-
-proto_library(
-    name = "zip_code_proto",
-    srcs = ["zip_code.proto"],
-)
-
-proto_library(
-    name = "address_proto",
-    srcs = ["address.proto"],
-    deps = [":zip_code_proto"],
-)
-
-proto_library(
-    name = "person_proto",
-    srcs = ["person.proto"],
-    deps = [
-        ":address_proto",
-        "@com_google_protobuf//:timestamp_proto",
-    ],
-)
-
-proto_library(
-    name = "stripped_zip_code_proto",
-    srcs = ["stripped_zip_code.proto"],
-    strip_import_prefix = "/tests/haskell_proto_library/",
-)
-
-proto_library(
-    name = "stripped_address_proto",
-    srcs = ["stripped_address.proto"],
-    strip_import_prefix = "/tests/haskell_proto_library/",
-    deps = [":stripped_zip_code_proto"],
-)
-
-haskell_proto_library(
-    name = "address_haskell_proto",
-    tags = ["requires_hackage"],
-    deps = [":address_proto"],
-)
-
-haskell_proto_library(
-    name = "stripped_address_haskell_proto",
-    tags = ["requires_hackage"],
-    deps = [":stripped_address_proto"],
-)
-
-haskell_proto_library(
-    name = "person_haskell_proto",
-    tags = ["requires_hackage"],
-    deps = [":person_proto"],
-)
-
-haskell_library(
-    name = "hs-lib",
-    srcs = ["Bar.hs"],
-    tags = ["requires_hackage"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":address_haskell_proto",
-        ":person_haskell_proto",
-        ":stripped_address_haskell_proto",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_doc(
-    name = "docs",
-    tags = ["requires_hackage"],
-    deps = [":hs-lib"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/haskell_proto_library/Bar.hs b/third_party/bazel/rules_haskell/tests/haskell_proto_library/Bar.hs
deleted file mode 100644
index fa95bf088c91..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_proto_library/Bar.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module Bar (bar) where
-
-import Proto.StrippedAddress
-import Proto.Tests.HaskellProtoLibrary.Person
-import Proto.Tests.HaskellProtoLibrary.Person_Fields
-
-bar :: Int
-bar = 5
diff --git a/third_party/bazel/rules_haskell/tests/haskell_proto_library/address.proto b/third_party/bazel/rules_haskell/tests/haskell_proto_library/address.proto
deleted file mode 100644
index d81642d8bcd4..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_proto_library/address.proto
+++ /dev/null
@@ -1,11 +0,0 @@
-syntax = "proto3";
-
-package demo; // Required to generate valid code.
-
-// Always import protos with a full path relative to the WORKSPACE file.
-import "tests/haskell_proto_library/zip_code.proto";
-
-message Address {
-  string city = 1;
-  ZipCode zip_code = 2;
-}
diff --git a/third_party/bazel/rules_haskell/tests/haskell_proto_library/person.proto b/third_party/bazel/rules_haskell/tests/haskell_proto_library/person.proto
deleted file mode 100644
index 95bf3524f819..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_proto_library/person.proto
+++ /dev/null
@@ -1,16 +0,0 @@
-syntax = "proto3";
-
-package demo; // Required to generate valid code.
-
-// Always import protos with a full path relative to the WORKSPACE file.
-import "tests/haskell_proto_library/address.proto";
-
-import "google/protobuf/timestamp.proto";
-
-message Person {
-  string name = 1;
-  int32 id = 2;
-  string email = 3;
-  Address address = 4;
-  google.protobuf.Timestamp timestamp = 5;
-}
diff --git a/third_party/bazel/rules_haskell/tests/haskell_proto_library/stripped_address.proto b/third_party/bazel/rules_haskell/tests/haskell_proto_library/stripped_address.proto
deleted file mode 100644
index 5b5ce47be83a..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_proto_library/stripped_address.proto
+++ /dev/null
@@ -1,10 +0,0 @@
-syntax = "proto3";
-
-package demo; // Required to generate valid code.
-
-import "stripped_zip_code.proto";
-
-message StrippedAddress {
-  string city = 1;
-  StrippedZipCode zip_code = 2;
-}
diff --git a/third_party/bazel/rules_haskell/tests/haskell_proto_library/stripped_zip_code.proto b/third_party/bazel/rules_haskell/tests/haskell_proto_library/stripped_zip_code.proto
deleted file mode 100644
index 690d7c9d99cc..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_proto_library/stripped_zip_code.proto
+++ /dev/null
@@ -1,7 +0,0 @@
-syntax = "proto3";
-
-package demo; // Required to generate valid code.
-
-message StrippedZipCode {
-  string code = 1;
-}
diff --git a/third_party/bazel/rules_haskell/tests/haskell_proto_library/zip_code.proto b/third_party/bazel/rules_haskell/tests/haskell_proto_library/zip_code.proto
deleted file mode 100644
index e72578cf2178..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_proto_library/zip_code.proto
+++ /dev/null
@@ -1,7 +0,0 @@
-syntax = "proto3";
-
-package demo; // Required to generate valid code.
-
-message ZipCode {
-  string code = 1;
-}
diff --git a/third_party/bazel/rules_haskell/tests/haskell_test/BUILD.bazel b/third_party/bazel/rules_haskell/tests/haskell_test/BUILD.bazel
deleted file mode 100644
index eb00b2c31881..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_test/BUILD.bazel
+++ /dev/null
@@ -1,29 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "mylib",
-    srcs = ["Lib.hs"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_test(
-    name = "haskell_test",
-    # Use some parameters that only test rules have.
-    size = "small",
-    timeout = "short",
-    srcs = ["Test.hs"],
-    flaky = False,
-    main_function = "Test.test",
-    visibility = ["//visibility:public"],
-    deps = [
-        ":mylib",
-        "//tests/data:ourclibrary",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/haskell_test/Lib.hs b/third_party/bazel/rules_haskell/tests/haskell_test/Lib.hs
deleted file mode 100644
index 3553d6b6f493..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_test/Lib.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Lib where
-
-foo :: Int
-foo = 42
diff --git a/third_party/bazel/rules_haskell/tests/haskell_test/Test.hs b/third_party/bazel/rules_haskell/tests/haskell_test/Test.hs
deleted file mode 100644
index 5ba65f82c94b..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_test/Test.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Test (test) where
-
-test :: IO ()
-test = putStrLn "haskell_test fired"
diff --git a/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/BUILD.bazel b/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/BUILD.bazel
deleted file mode 100644
index 6c36ce4bdbf1..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/BUILD.bazel
+++ /dev/null
@@ -1,26 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "Lib",
-    srcs = ["Lib.hs"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:bytestring",
-    ],
-)
-
-haskell_test(
-    name = "binary",
-    srcs = ["Bin.hs"],
-    deps = [
-        ":Lib",
-        "//tests/hackage:base",
-        "//tests/hackage:text",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/Bin.hs b/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/Bin.hs
deleted file mode 100644
index a0e7117d2e22..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/Bin.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module Main (main) where
-
-import qualified Data.Text.IO as T
-import qualified Data.Text.Encoding as E
-
-import Lib (message)
-
-main = T.putStrLn $ E.decodeUtf8 message
diff --git a/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/Lib.hs b/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/Lib.hs
deleted file mode 100644
index 66a2161a19c4..000000000000
--- a/third_party/bazel/rules_haskell/tests/haskell_toolchain_library/Lib.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-module Lib (message) where
-
-import qualified Data.ByteString.Char8 as B
-
-message = B.pack "hello, world"
diff --git a/third_party/bazel/rules_haskell/tests/hidden-modules/BUILD.bazel b/third_party/bazel/rules_haskell/tests/hidden-modules/BUILD.bazel
deleted file mode 100644
index 5d79e56085a2..000000000000
--- a/third_party/bazel/rules_haskell/tests/hidden-modules/BUILD.bazel
+++ /dev/null
@@ -1,35 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(
-    default_testonly = 1,
-    default_visibility = ["//visibility:public"],
-)
-
-haskell_library(
-    name = "lib-a",
-    srcs = glob(["lib-a/*.hs"]),
-    hidden_modules = ["Foo"],
-    src_strip_prefix = "lib-a",
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_library(
-    name = "lib-b",
-    srcs = glob(["lib-b/*.hs"]),
-    src_strip_prefix = "lib-b",
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_library(
-    name = "lib-c",
-    srcs = glob(["lib-c/*.hs"]),
-    src_strip_prefix = "lib-c",
-    deps = [
-        ":lib-a",
-        ":lib-b",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/hidden-modules/lib-a/Bar.hs b/third_party/bazel/rules_haskell/tests/hidden-modules/lib-a/Bar.hs
deleted file mode 100644
index 5bc9c68895bf..000000000000
--- a/third_party/bazel/rules_haskell/tests/hidden-modules/lib-a/Bar.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Bar (bar) where
-
-import Foo (foo)
-
-bar :: Int
-bar = foo * 2
diff --git a/third_party/bazel/rules_haskell/tests/hidden-modules/lib-a/Foo.hs b/third_party/bazel/rules_haskell/tests/hidden-modules/lib-a/Foo.hs
deleted file mode 100644
index 664be00d5487..000000000000
--- a/third_party/bazel/rules_haskell/tests/hidden-modules/lib-a/Foo.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Foo (foo) where
-
-foo :: Int
-foo = 15
diff --git a/third_party/bazel/rules_haskell/tests/hidden-modules/lib-b/Foo.hs b/third_party/bazel/rules_haskell/tests/hidden-modules/lib-b/Foo.hs
deleted file mode 100644
index 6fdd42f9a8cd..000000000000
--- a/third_party/bazel/rules_haskell/tests/hidden-modules/lib-b/Foo.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Foo (foo) where
-
-foo :: Int
-foo = 16
diff --git a/third_party/bazel/rules_haskell/tests/hidden-modules/lib-c/Baz.hs b/third_party/bazel/rules_haskell/tests/hidden-modules/lib-c/Baz.hs
deleted file mode 100644
index 055b2e80ad79..000000000000
--- a/third_party/bazel/rules_haskell/tests/hidden-modules/lib-c/Baz.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module Baz (bar) where
-
-import Foo (foo)
-import Bar (bar)
-
-baz :: Int
-baz = foo + bar
diff --git a/third_party/bazel/rules_haskell/tests/hs-boot/A.hs-boot.in b/third_party/bazel/rules_haskell/tests/hs-boot/A.hs-boot.in
deleted file mode 100644
index 02d37ced950f..000000000000
--- a/third_party/bazel/rules_haskell/tests/hs-boot/A.hs-boot.in
+++ /dev/null
@@ -1,2 +0,0 @@
-module A where
-  newtype TA = MkTA Int
diff --git a/third_party/bazel/rules_haskell/tests/hs-boot/A.hs.in b/third_party/bazel/rules_haskell/tests/hs-boot/A.hs.in
deleted file mode 100644
index deeff5470b77..000000000000
--- a/third_party/bazel/rules_haskell/tests/hs-boot/A.hs.in
+++ /dev/null
@@ -1,8 +0,0 @@
-module A where
-
-import B (TB (..))
-
-newtype TA = MkTA Int
-
-f :: TB -> TA
-f (MkTB x) = MkTA x
diff --git a/third_party/bazel/rules_haskell/tests/hs-boot/BUILD.bazel b/third_party/bazel/rules_haskell/tests/hs-boot/BUILD.bazel
deleted file mode 100644
index 4e69da0e6b34..000000000000
--- a/third_party/bazel/rules_haskell/tests/hs-boot/BUILD.bazel
+++ /dev/null
@@ -1,48 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-genrule(
-    name = "gen-A-boot",
-    srcs = ["A.hs-boot.in"],
-    outs = ["srcs/A.hs-boot"],
-    cmd = "cp $< $@",
-)
-
-genrule(
-    name = "gen-A",
-    srcs = ["A.hs.in"],
-    outs = ["srcs/A.hs"],
-    cmd = "cp $< $@",
-)
-
-haskell_library(
-    name = "hs-boot-lib",
-    srcs = [
-        "srcs/B.hs",
-        ":gen-A",
-        ":gen-A-boot",
-    ],
-    src_strip_prefix = "srcs",
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_test(
-    name = "hs-boot",
-    srcs = [
-        "MA.hs",
-        "MA.hs-boot",
-        "MB.hs",
-        "Main.hs",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":hs-boot-lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/hs-boot/MA.hs b/third_party/bazel/rules_haskell/tests/hs-boot/MA.hs
deleted file mode 100644
index 4e0128596242..000000000000
--- a/third_party/bazel/rules_haskell/tests/hs-boot/MA.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module MA where
-
-import MB (TB (..))
-
-newtype TA = MkTA Int
-
-f :: TB -> TA
-f (MkTB x) = MkTA x
diff --git a/third_party/bazel/rules_haskell/tests/hs-boot/MA.hs-boot b/third_party/bazel/rules_haskell/tests/hs-boot/MA.hs-boot
deleted file mode 100644
index 0ab8c899f2e1..000000000000
--- a/third_party/bazel/rules_haskell/tests/hs-boot/MA.hs-boot
+++ /dev/null
@@ -1,2 +0,0 @@
-module MA where
-  newtype TA = MkTA Int
diff --git a/third_party/bazel/rules_haskell/tests/hs-boot/MB.hs b/third_party/bazel/rules_haskell/tests/hs-boot/MB.hs
deleted file mode 100644
index d90d041d578e..000000000000
--- a/third_party/bazel/rules_haskell/tests/hs-boot/MB.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module MB where
-
-import {-# SOURCE #-} MA (TA (..))
-
-data TB = MkTB !Int
-
-g :: TA -> TB
-g (MkTA x) = MkTB x
diff --git a/third_party/bazel/rules_haskell/tests/hs-boot/Main.hs b/third_party/bazel/rules_haskell/tests/hs-boot/Main.hs
deleted file mode 100644
index 15c0085fe079..000000000000
--- a/third_party/bazel/rules_haskell/tests/hs-boot/Main.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-module Main (main) where
-
-import A ()
-import B ()
-import MA ()
-import MB ()
-
-main :: IO ()
-main = putStrLn "hsboot"
diff --git a/third_party/bazel/rules_haskell/tests/hs-boot/srcs/B.hs b/third_party/bazel/rules_haskell/tests/hs-boot/srcs/B.hs
deleted file mode 100644
index 60e1ff5f3edd..000000000000
--- a/third_party/bazel/rules_haskell/tests/hs-boot/srcs/B.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module B where
-
-import {-# SOURCE #-} A (TA (..))
-
-data TB = MkTB !Int
-
-g :: TA -> TB
-g (MkTA x) = MkTB x
diff --git a/third_party/bazel/rules_haskell/tests/hsc/BUILD.bazel b/third_party/bazel/rules_haskell/tests/hsc/BUILD.bazel
deleted file mode 100644
index 1e9a07cd5e08..000000000000
--- a/third_party/bazel/rules_haskell/tests/hsc/BUILD.bazel
+++ /dev/null
@@ -1,35 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "hsc-lib",
-    srcs = [
-        "Bar.hsc",
-        "Bar/Baz.hsc",
-        "Flags.hsc",
-        "Foo.hsc",
-    ],
-    compiler_flags = [
-        "-DTHIS_IS_TRUE",
-        "-optP-DTHIS_TOO_IS_TRUE",
-    ],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_test(
-    name = "hsc",
-    srcs = [
-        "BinHsc.hsc",
-        "Main.hs",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":hsc-lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/hsc/Bar.hsc b/third_party/bazel/rules_haskell/tests/hsc/Bar.hsc
deleted file mode 100644
index a8bb791513b5..000000000000
--- a/third_party/bazel/rules_haskell/tests/hsc/Bar.hsc
+++ /dev/null
@@ -1,6 +0,0 @@
-module Bar (hscFiredBar) where
-
-#ifndef _INTERNAL_HSC_DO_NOT_DEFINE_ME
-hscFiredBar :: String
-hscFiredBar = "hscFiredBar"
-#endif
diff --git a/third_party/bazel/rules_haskell/tests/hsc/Bar/Baz.hsc b/third_party/bazel/rules_haskell/tests/hsc/Bar/Baz.hsc
deleted file mode 100644
index 7db172485de5..000000000000
--- a/third_party/bazel/rules_haskell/tests/hsc/Bar/Baz.hsc
+++ /dev/null
@@ -1,6 +0,0 @@
-module Bar.Baz (hscFiredBaz) where
-
-#ifndef _INTERNAL_HSC_DO_NOT_DEFINE_ME
-hscFiredBaz :: String
-hscFiredBaz = "hscFiredBaz"
-#endif
diff --git a/third_party/bazel/rules_haskell/tests/hsc/BinHsc.hsc b/third_party/bazel/rules_haskell/tests/hsc/BinHsc.hsc
deleted file mode 100644
index ddfee79c137c..000000000000
--- a/third_party/bazel/rules_haskell/tests/hsc/BinHsc.hsc
+++ /dev/null
@@ -1 +0,0 @@
-module BinHsc () where
\ No newline at end of file
diff --git a/third_party/bazel/rules_haskell/tests/hsc/Flags.hsc b/third_party/bazel/rules_haskell/tests/hsc/Flags.hsc
deleted file mode 100644
index b090df576ab4..000000000000
--- a/third_party/bazel/rules_haskell/tests/hsc/Flags.hsc
+++ /dev/null
@@ -1,8 +0,0 @@
-module Flags (hscFlags) where
-
-#ifdef THIS_IS_TRUE
-#ifdef THIS_TOO_IS_TRUE
-hscFlags :: String
-hscFlags = "hscFlags"
-#endif
-#endif
diff --git a/third_party/bazel/rules_haskell/tests/hsc/Foo.hsc b/third_party/bazel/rules_haskell/tests/hsc/Foo.hsc
deleted file mode 100644
index 2cb726e18110..000000000000
--- a/third_party/bazel/rules_haskell/tests/hsc/Foo.hsc
+++ /dev/null
@@ -1,8 +0,0 @@
-module Foo (hscFiredFoo) where
-
-#if __GLASGOW_HASKELL__ >= 700
-#ifndef _INTERNAL_HSC_DO_NOT_DEFINE_ME
-hscFiredFoo :: String
-hscFiredFoo = "hscFiredFoo"
-#endif
-#endif
diff --git a/third_party/bazel/rules_haskell/tests/hsc/Main.hs b/third_party/bazel/rules_haskell/tests/hsc/Main.hs
deleted file mode 100644
index 33ff7f10f78c..000000000000
--- a/third_party/bazel/rules_haskell/tests/hsc/Main.hs
+++ /dev/null
@@ -1,10 +0,0 @@
-module Main (main) where
-
-import BinHsc ()
-import Foo (hscFiredFoo)
-import Bar (hscFiredBar)
-import Bar.Baz (hscFiredBaz)
-import Flags (hscFlags)
-
-main :: IO ()
-main = putStrLn (hscFiredFoo ++ hscFiredBar ++ hscFiredBaz ++ hscFlags)
diff --git a/third_party/bazel/rules_haskell/tests/indirect-link/BUILD.bazel b/third_party/bazel/rules_haskell/tests/indirect-link/BUILD.bazel
deleted file mode 100644
index 60403a4ef277..000000000000
--- a/third_party/bazel/rules_haskell/tests/indirect-link/BUILD.bazel
+++ /dev/null
@@ -1,52 +0,0 @@
-load("@io_tweag_rules_haskell//haskell:haskell.bzl", "haskell_library", "haskell_test", "haskell_toolchain_library")
-
-cc_library(
-    name = "cbits-indirect",
-    srcs = ["cbits/impl.c"],
-)
-
-cc_library(
-    name = "cbits",
-    srcs = ["cbits/intf.c"],
-    deps = ["cbits-indirect"],
-)
-
-haskell_library(
-    name = "mypkg",
-    srcs = ["src/MyModule.hs"],
-    src_strip_prefix = "src",
-    deps = [
-        ":cbits",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_test(
-    name = "indirect-link-static",
-    srcs = ["test/Main.hs"],
-    linkstatic = True,
-    src_strip_prefix = "test",
-    deps = [
-        ":mypkg",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_test(
-    name = "indirect-link-dynamic",
-    srcs = ["test/Main.hs"],
-    linkstatic = False,
-    src_strip_prefix = "test",
-    deps = [
-        ":mypkg",
-        "//tests/hackage:base",
-    ],
-)
-
-test_suite(
-    name = "indirect-link",
-    tests = [
-        ":indirect-link-dynamic",
-        ":indirect-link-static",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/indirect-link/cbits/impl.c b/third_party/bazel/rules_haskell/tests/indirect-link/cbits/impl.c
deleted file mode 100644
index 666ce43962a3..000000000000
--- a/third_party/bazel/rules_haskell/tests/indirect-link/cbits/impl.c
+++ /dev/null
@@ -1,9 +0,0 @@
-static int thing;
-
-int real_get_thing(void) {
-  return thing;
-}
-
-void real_set_thing(int value) {
-  thing = value;
-}
diff --git a/third_party/bazel/rules_haskell/tests/indirect-link/cbits/intf.c b/third_party/bazel/rules_haskell/tests/indirect-link/cbits/intf.c
deleted file mode 100644
index f7a8f5e9f2e8..000000000000
--- a/third_party/bazel/rules_haskell/tests/indirect-link/cbits/intf.c
+++ /dev/null
@@ -1,10 +0,0 @@
-extern int real_get_thing(void);
-extern void real_set_thing(int value);
-
-int get_thing(void) {
-  return real_get_thing();
-}
-
-void set_thing(int value) {
-  real_set_thing(value);
-}
diff --git a/third_party/bazel/rules_haskell/tests/indirect-link/src/MyModule.hs b/third_party/bazel/rules_haskell/tests/indirect-link/src/MyModule.hs
deleted file mode 100644
index 4b75cee13989..000000000000
--- a/third_party/bazel/rules_haskell/tests/indirect-link/src/MyModule.hs
+++ /dev/null
@@ -1,11 +0,0 @@
-module MyModule where
-
-foreign import ccall get_thing :: IO Int
-
-getThing :: IO Int
-getThing = get_thing
-
-foreign import ccall set_thing :: Int -> IO ()
-
-setThing :: Int -> IO ()
-setThing = set_thing
diff --git a/third_party/bazel/rules_haskell/tests/indirect-link/test/Main.hs b/third_party/bazel/rules_haskell/tests/indirect-link/test/Main.hs
deleted file mode 100644
index 0b3d188d736a..000000000000
--- a/third_party/bazel/rules_haskell/tests/indirect-link/test/Main.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-module Main (main) where
-
-import qualified MyModule
-
-main :: IO ()
-main = do
-  print =<< MyModule.getThing
-  MyModule.setThing 123
-  print =<< MyModule.getThing
diff --git a/third_party/bazel/rules_haskell/tests/inline_tests.bzl b/third_party/bazel/rules_haskell/tests/inline_tests.bzl
deleted file mode 100644
index b1ba001c6ec7..000000000000
--- a/third_party/bazel/rules_haskell/tests/inline_tests.bzl
+++ /dev/null
@@ -1,90 +0,0 @@
-# features sh_inline_test and py_inline_test,
-# which are like their respective builtin rules,
-# but their scripts can be given inline as a string.
-
-load("@bazel_skylib//lib:shell.bzl", "shell")
-
-def quote_make_variables(s):
-    """Quote all genrule “Make” Variables in a string."""
-    return s.replace("$", "$$")
-
-def target_from_string(name, string):
-    """Write a skylark string to a target."""
-    native.genrule(
-        name = name + "-file",
-        outs = [name],
-        # this is exceptionally ugly.
-        cmd = """echo -n {quoted} > $(@)""".format(
-            # but should at least be quoted right
-            quoted = shell.quote(quote_make_variables(string)),
-        ),
-    )
-
-bash_runfiles_boilerplate = """\
-# Copy-pasted from Bazel's Bash runfiles library (tools/bash/runfiles/runfiles.bash).
-set -euo pipefail
-if [[ ! -d "${RUNFILES_DIR:-/dev/null}" && ! -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
-  if [[ -f "$0.runfiles_manifest" ]]; then
-    export RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
-  elif [[ -f "$0.runfiles/MANIFEST" ]]; then
-    export RUNFILES_MANIFEST_FILE="$0.runfiles/MANIFEST"
-  elif [[ -f "$0.runfiles/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
-    export RUNFILES_DIR="$0.runfiles"
-  fi
-fi
-if [[ -f "${RUNFILES_DIR:-/dev/null}/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
-  source "${RUNFILES_DIR}/bazel_tools/tools/bash/runfiles/runfiles.bash"
-elif [[ -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
-  source "$(grep -m1 "^bazel_tools/tools/bash/runfiles/runfiles.bash " \
-            "$RUNFILES_MANIFEST_FILE" | cut -d ' ' -f 2-)"
-else
-  echo >&2 "ERROR: cannot find @bazel_tools//tools/bash/runfiles:runfiles.bash"
-  exit 1
-fi
-# --- end runfiles.bash initialization ---
-"""
-
-def sh_inline_test(name, script, **kwargs):
-    """Like sh_test, but instead of srcs takes the shell script
-    as verbatim bazel string. The bash runfiles are in scope,
-    using `rlocation` works by default.
-    """
-    script_name = name + ".sh"
-    script = bash_runfiles_boilerplate + script
-
-    target_from_string(script_name, script)
-
-    deps = kwargs.pop("deps", [])
-
-    native.sh_test(
-        name = name,
-        srcs = [script_name],
-        deps = ["@bazel_tools//tools/bash/runfiles"] + deps,
-        **kwargs
-    )
-
-python_runfiles_boilerplate = """
-from bazel_tools.tools.python.runfiles import runfiles
-r = runfiles.Create()
-"""
-
-def py_inline_test(name, script, **kwargs):
-    """Like py_test, but instead of srcs takes the shell script
-    as verbatim bazel string. The python runfiles are in scope
-    as the `r` variable. Use `r.Rlocation()`
-    """
-    script_name = name + ".py"
-    script = python_runfiles_boilerplate + script
-
-    target_from_string(script_name, script)
-
-    deps = kwargs.pop("deps", [])
-    srcs = kwargs.pop("srcs", [])
-
-    native.py_test(
-        name = name,
-        srcs = [script_name] + srcs,
-        main = script_name,
-        deps = ["@bazel_tools//tools/python/runfiles"] + deps,
-        **kwargs
-    )
diff --git a/third_party/bazel/rules_haskell/tests/java_classpath/BUILD.bazel b/third_party/bazel/rules_haskell/tests/java_classpath/BUILD.bazel
deleted file mode 100644
index b2e5b86daeb9..000000000000
--- a/third_party/bazel/rules_haskell/tests/java_classpath/BUILD.bazel
+++ /dev/null
@@ -1,17 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "java_classpath",
-    srcs = ["Main.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-        "@org_apache_spark_spark_core_2_10//jar",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/java_classpath/Main.hs b/third_party/bazel/rules_haskell/tests/java_classpath/Main.hs
deleted file mode 100644
index 13f7b9d51684..000000000000
--- a/third_party/bazel/rules_haskell/tests/java_classpath/Main.hs
+++ /dev/null
@@ -1,17 +0,0 @@
-{-# LANGUAGE LambdaCase      #-}
-{-# LANGUAGE TemplateHaskell #-}
-module Main (main) where
-
-import qualified Language.Haskell.TH as TH (runIO)
-import qualified Language.Haskell.TH.Syntax as TH (lift)
-import           System.Environment (lookupEnv)
-
-main :: IO ()
-main = putStrLn $(
-  let ensureClassPath :: IO String
-      ensureClassPath = lookupEnv "CLASSPATH" >>= \case
-        Nothing -> error "CLASSPATH not set when it was expected to be."
-        Just "" -> error "CLASSPATH empty when it was expected to have content."
-        Just cpath -> pure $ "java-classpath at compile time: " ++ cpath
-  in TH.runIO ensureClassPath >>= TH.lift
-  )
diff --git a/third_party/bazel/rules_haskell/tests/lhs/BUILD.bazel b/third_party/bazel/rules_haskell/tests/lhs/BUILD.bazel
deleted file mode 100644
index e344ee6def1c..000000000000
--- a/third_party/bazel/rules_haskell/tests/lhs/BUILD.bazel
+++ /dev/null
@@ -1,23 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "lhs-lib",
-    srcs = ["Lib.lhs"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_test(
-    name = "lhs-bin",
-    srcs = ["Main.lhs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":lhs-lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/lhs/Lib.lhs b/third_party/bazel/rules_haskell/tests/lhs/Lib.lhs
deleted file mode 100644
index f37350df70f7..000000000000
--- a/third_party/bazel/rules_haskell/tests/lhs/Lib.lhs
+++ /dev/null
@@ -1,4 +0,0 @@
-> module Lib (lib) where
-
-> lib :: String
-> lib = "lhs"
diff --git a/third_party/bazel/rules_haskell/tests/lhs/Main.lhs b/third_party/bazel/rules_haskell/tests/lhs/Main.lhs
deleted file mode 100644
index a9e0659dddf5..000000000000
--- a/third_party/bazel/rules_haskell/tests/lhs/Main.lhs
+++ /dev/null
@@ -1,6 +0,0 @@
-> module Main (main) where
-
-> import Lib (lib)
-
-> main :: IO ()
-> main = putStrLn lib
diff --git a/third_party/bazel/rules_haskell/tests/library-deps/BUILD.bazel b/third_party/bazel/rules_haskell/tests/library-deps/BUILD.bazel
deleted file mode 100644
index d6844e1ac120..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-deps/BUILD.bazel
+++ /dev/null
@@ -1,28 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "library-deps",
-    srcs = ["TestLib.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/library-deps/sublib",
-    ],
-)
-
-haskell_test(
-    name = "bin-deps",
-    size = "small",
-    srcs = ["Bin.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/library-deps/sublib",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-deps/Bin.hs b/third_party/bazel/rules_haskell/tests/library-deps/Bin.hs
deleted file mode 100644
index 8d12d0bdd23f..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-deps/Bin.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main (main) where
-
-import TestSubLib (messageEnd)
-
-main :: IO ()
-main = putStrLn $ messageEnd
diff --git a/third_party/bazel/rules_haskell/tests/library-deps/TestLib.hs b/third_party/bazel/rules_haskell/tests/library-deps/TestLib.hs
deleted file mode 100644
index fe917fecf3b7..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-deps/TestLib.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-module TestLib (testMessage) where
-
-import TestSubLib (messageEnd)
-
-testMessage :: String
-testMessage = "hello " ++ messageEnd
-
--- Force dynamic linking
-{-# ANN testMessage () #-}
diff --git a/third_party/bazel/rules_haskell/tests/library-deps/sublib/BUILD.bazel b/third_party/bazel/rules_haskell/tests/library-deps/sublib/BUILD.bazel
deleted file mode 100644
index 5f3028e2e02c..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-deps/sublib/BUILD.bazel
+++ /dev/null
@@ -1,21 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "sublib",
-    srcs = ["TestSubLib.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":sublib-c",
-        "//tests/hackage:base",
-    ],
-)
-
-cc_library(
-    name = "sublib-c",
-    srcs = ["sublib-c.c"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-deps/sublib/TestSubLib.hs b/third_party/bazel/rules_haskell/tests/library-deps/sublib/TestSubLib.hs
deleted file mode 100644
index 1e8d2d475552..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-deps/sublib/TestSubLib.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
-module TestSubLib (messageEnd) where
-
-messageEnd :: String
-messageEnd = "world " ++ show (foo 10)
-
-foreign import ccall foo :: Int -> Int
diff --git a/third_party/bazel/rules_haskell/tests/library-deps/sublib/sublib-c.c b/third_party/bazel/rules_haskell/tests/library-deps/sublib/sublib-c.c
deleted file mode 100644
index 2f3be3eb9ed7..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-deps/sublib/sublib-c.c
+++ /dev/null
@@ -1,3 +0,0 @@
-int foo(int x) {
-  return x * 2;
-}
diff --git a/third_party/bazel/rules_haskell/tests/library-exports/BUILD.bazel b/third_party/bazel/rules_haskell/tests/library-exports/BUILD.bazel
deleted file mode 100644
index c88e68ebbee4..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-exports/BUILD.bazel
+++ /dev/null
@@ -1,41 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "sublib",
-    srcs = ["TestSubLib.hs"],
-    exports = {"//tests/hackage:containers": "Data.Map as SubLib.Map"},
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:containers",
-    ],
-)
-
-haskell_library(
-    name = "lib",
-    srcs = ["TestLib.hs"],
-    exports = {
-        ":sublib": "TestSubLib",
-        "//tests/hackage:containers": "Data.Map as Lib.Map",
-    },
-    deps = [
-        ":sublib",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_test(
-    name = "library-exports",
-    size = "small",
-    srcs = ["Bin.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-exports/Bin.hs b/third_party/bazel/rules_haskell/tests/library-exports/Bin.hs
deleted file mode 100644
index b724bb89d1c2..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-exports/Bin.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module Main (main) where
-
-import TestSubLib (messageEnd)
-import Lib.Map
-
-main :: IO ()
-main = print $ Lib.Map.singleton 1 messageEnd
diff --git a/third_party/bazel/rules_haskell/tests/library-exports/TestLib.hs b/third_party/bazel/rules_haskell/tests/library-exports/TestLib.hs
deleted file mode 100644
index c889c2cc31ac..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-exports/TestLib.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module TestLib (testMessage) where
-
-import TestSubLib (messageEnd)
-import SubLib.Map
-
-testMessage :: String
-testMessage = "hello " ++ messageEnd
diff --git a/third_party/bazel/rules_haskell/tests/library-exports/TestSubLib.hs b/third_party/bazel/rules_haskell/tests/library-exports/TestSubLib.hs
deleted file mode 100644
index 2e1f3f983f40..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-exports/TestSubLib.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
-module TestSubLib (messageEnd) where
-
-messageEnd :: String
-messageEnd = "world"
diff --git a/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/BUILD.bazel b/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/BUILD.bazel
deleted file mode 100644
index 0b7cae3d7a65..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/BUILD.bazel
+++ /dev/null
@@ -1,112 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-load("//tests:inline_tests.bzl", "sh_inline_test")
-load(":get_library_files.bzl", "get_libraries_as_runfiles")
-
-# test whether `linkstatic` works as expected
-package(default_testonly = 1)
-
-# only .a files
-haskell_library(
-    name = "library-static-only",
-    srcs = ["Lib.hs"],
-    linkstatic = True,  # <--
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:bytestring",
-    ],
-)
-
-# both .a and .so files
-haskell_library(
-    name = "library-static-and-dynamic",
-    srcs = ["Lib.hs"],
-    linkstatic = False,  # <--
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:bytestring",
-    ],
-)
-
-# extract all libraries from the haskell_library
-get_libraries_as_runfiles(
-    name = "library-static-only-libraries",
-    library = ":library-static-only",
-)
-
-get_libraries_as_runfiles(
-    name = "library-static-and-dynamic-libraries",
-    library = ":library-static-and-dynamic",
-)
-
-# sh_test’s `data` doesn’t add stuff to runfiles :(
-# sh_library can bundle different targets as runfiles for sh_test
-# TODO(Profpatsch): add functionality to sh_inline_test by default?
-sh_library(
-    name = "bundled-dependency-files-static-only",
-    data = [":library-static-only-libraries"],
-)
-
-sh_library(
-    name = "bundled-dependency-files-static-and-dynamic",
-    data = [":library-static-and-dynamic-libraries"],
-)
-
-# ensure that linkstatic=True only creates only .a, no .so
-sh_inline_test(
-    name = "library-linkstatic-flag",
-    size = "small",
-    # pass the file names as arguments
-    args = ["$(rootpaths :library-static-only-libraries)"],
-    data = [
-        # for rootpaths
-        ":library-static-only-libraries",
-        # to actually get the files …
-        ":bundled-dependency-files-static-only",
-    ],
-    script = """
-set -euo pipefail
-for f in "$@"; do
-    if ! [[ "$f" =~ .a$ ]]; then
-      echo "not a static library: $f"
-      exit 1
-    fi
-done
-""",
-)
-
-# test whether .so is linked dynamically and .a statically
-sh_inline_test(
-    name = "test-libraries-static-and-dynamic",
-    size = "small",
-    # pass the file names as arguments
-    args = ["$(rootpaths :library-static-and-dynamic-libraries)"],
-    data = [
-        # for rootpaths
-        ":library-static-and-dynamic-libraries",
-        # to actually get the files …
-        ":bundled-dependency-files-static-and-dynamic",
-    ],
-    script = """
-set -euo pipefail
-is_dynamic () {
-    # taken from https://github.com/NixOS/nixpkgs/blob/0b3f50f844e2a6b507b18d7c5259bb850b382f87/pkgs/build-support/setup-hooks/auto-patchelf.sh#L167-L170
-    readelf -l -- "$1" | grep -q "^ *INTERP\\>"
-}
-
-for f in "$@"; do
-    if [[ "$f" =~ .a$ ]] && is_dynamic "$f"; then
-        echo "should be a static executable: $f"
-        exit 1
-    fi
-    if [[ "$f" =~ .so$ ]] && ! is_dynamic "$f"; then
-        echo "should be a dynamic executable: $f"
-        exit 1
-    fi
-done
-""",
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/Lib.hs b/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/Lib.hs
deleted file mode 100644
index 66a2161a19c4..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/Lib.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-module Lib (message) where
-
-import qualified Data.ByteString.Char8 as B
-
-message = B.pack "hello, world"
diff --git a/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/Main.hs b/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/Main.hs
deleted file mode 100644
index 2048dbdecd9a..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/Main.hs
+++ /dev/null
@@ -1,3 +0,0 @@
-module Main where
-
-main = putStrLn "hello world"
diff --git a/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/get_library_files.bzl b/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/get_library_files.bzl
deleted file mode 100644
index 31702bfcfa07..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-linkstatic-flag/get_library_files.bzl
+++ /dev/null
@@ -1,28 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:providers.bzl",
-    "HaskellInfo",
-    "HaskellLibraryInfo",
-)
-load("//haskell:private/set.bzl", "set")
-
-def _get_libraries_as_runfiles_impl(ctx):
-    """Extract all library files from a haskell_library target
-    and put them in this target’s files"""
-    bi = ctx.attr.library[HaskellInfo]
-    return [DefaultInfo(
-        # not necessarily complete
-        files = depset(
-            direct = bi.static_libraries,
-            transitive = [set.to_depset(bi.dynamic_libraries)],
-        ),
-    )]
-
-get_libraries_as_runfiles = rule(
-    _get_libraries_as_runfiles_impl,
-    attrs = {
-        "library": attr.label(
-            mandatory = True,
-            providers = [HaskellInfo, HaskellLibraryInfo],
-        ),
-    },
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-with-cbits/AddOne.hsc b/third_party/bazel/rules_haskell/tests/library-with-cbits/AddOne.hsc
deleted file mode 100644
index b4c446d412c7..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-cbits/AddOne.hsc
+++ /dev/null
@@ -1,3 +0,0 @@
-module AddOne where
-
-foreign import ccall "c_add_one" addOne :: Int -> Int
diff --git a/third_party/bazel/rules_haskell/tests/library-with-cbits/AddOne2.hs b/third_party/bazel/rules_haskell/tests/library-with-cbits/AddOne2.hs
deleted file mode 100644
index f2088f1c6600..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-cbits/AddOne2.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module AddOne2
-  ( addOne2
-  ) where
-
-import AddOne
-
-addOne2 = addOne
diff --git a/third_party/bazel/rules_haskell/tests/library-with-cbits/BUILD.bazel b/third_party/bazel/rules_haskell/tests/library-with-cbits/BUILD.bazel
deleted file mode 100644
index c320502ebf3f..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-cbits/BUILD.bazel
+++ /dev/null
@@ -1,36 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_toolchain_library",
-)
-
-haskell_library(
-    name = "library-with-cbits",
-    srcs = ["AddOne.hsc"],
-    linkstatic = False,
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/data:ourclibrary",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_library(
-    name = "library-with-cbits-indirect",
-    srcs = ["AddOne2.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":library-with-cbits",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_library(
-    name = "library-with-cbits-static",
-    srcs = ["AddOne.hsc"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/data:ourclibrary-static",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-with-includes/BUILD.bazel b/third_party/bazel/rules_haskell/tests/library-with-includes/BUILD.bazel
deleted file mode 100644
index 37b5a2ee986e..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-includes/BUILD.bazel
+++ /dev/null
@@ -1,29 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-genrule(
-    name = "gen-a",
-    outs = ["a.h"],
-    cmd = "echo '#define A 42' >> $@",
-)
-
-cc_library(
-    name = "clib",
-    hdrs = [
-        "b.h",
-        ":gen-a",
-    ],
-)
-
-haskell_library(
-    name = "library-with-includes",
-    srcs = ["Lib.hs"],
-    deps = [
-        ":clib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-with-includes/Lib.hs b/third_party/bazel/rules_haskell/tests/library-with-includes/Lib.hs
deleted file mode 100644
index 1ca98d615c4a..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-includes/Lib.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-{-# LANGUAGE CPP #-}
-module Lib (x) where
-
-#include "tests/library-with-includes/a.h"
-#include "tests/library-with-includes/b.h"
-
-x :: Int
-x = A + B
diff --git a/third_party/bazel/rules_haskell/tests/library-with-includes/b.h b/third_party/bazel/rules_haskell/tests/library-with-includes/b.h
deleted file mode 100644
index 3425137bf9cf..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-includes/b.h
+++ /dev/null
@@ -1 +0,0 @@
-#define B 17
diff --git a/third_party/bazel/rules_haskell/tests/library-with-sysdeps/BUILD.bazel b/third_party/bazel/rules_haskell/tests/library-with-sysdeps/BUILD.bazel
deleted file mode 100644
index 0e34f688fd69..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-sysdeps/BUILD.bazel
+++ /dev/null
@@ -1,32 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "library-with-sysdeps",
-    srcs = ["Lib.hs"],
-    tags = ["requires_zlib"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "@zlib",
-    ],
-)
-
-haskell_test(
-    name = "bin",
-    srcs = ["Main.hs"],
-    expected_covered_expressions_percentage = 100,
-    tags = [
-        "coverage-compatible",
-        "requires_zlib",
-    ],
-    deps = [
-        ":library-with-sysdeps",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-with-sysdeps/Lib.hs b/third_party/bazel/rules_haskell/tests/library-with-sysdeps/Lib.hs
deleted file mode 100644
index 771dd7faf10f..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-sysdeps/Lib.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module Lib (crc) where
-
-import Foreign.Ptr
-import Foreign.C.Types
-
-foreign import ccall crc32 :: CLong -> Ptr () -> CInt -> IO ()
-
-crc = crc32 0 nullPtr 0
diff --git a/third_party/bazel/rules_haskell/tests/library-with-sysdeps/Main.hs b/third_party/bazel/rules_haskell/tests/library-with-sysdeps/Main.hs
deleted file mode 100644
index b892de88c4a7..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-sysdeps/Main.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-module Main where
-
-import Lib (crc)
-
-main = crc
diff --git a/third_party/bazel/rules_haskell/tests/library-with-sysincludes/BUILD.bazel b/third_party/bazel/rules_haskell/tests/library-with-sysincludes/BUILD.bazel
deleted file mode 100644
index ddd5de65198c..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-sysincludes/BUILD.bazel
+++ /dev/null
@@ -1,86 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-genrule(
-    name = "genrule-header",
-    outs = [
-        "include/foo.h",
-    ],
-    cmd = "touch $(location include/foo.h)",
-)
-
-# A locally-defined replica of @zlib.dev//:zlib.
-# Since that shared library lives in another package, we must
-# use an absolute path for strip_include_prefix.
-cc_library(
-    name = "zlib",
-    hdrs = ["@zlib.dev//:include"],
-    strip_include_prefix = "/external/zlib.dev/include",
-    tags = ["requires_zlib"],
-    deps = ["@zlib"],
-)
-
-cc_library(
-    name = "zlib-with-genrule-header",
-    hdrs = [":genrule-header"],
-    strip_include_prefix = "include",
-    tags = ["requires_zlib"],
-)
-
-haskell_library(
-    name = "intermediate-library",
-    srcs = ["IntLib.hsc"],
-    tags = ["requires_zlib"],
-    deps = [
-        ":zlib",
-        ":zlib-with-genrule-header",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_library(
-    name = "library-with-sysincludes",
-    srcs = [
-        "Lib.hs",
-        "TH.hs",
-    ],
-    tags = ["requires_zlib"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":intermediate-library",
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-    ],
-)
-
-# Replicate the above example, but use the externally-defined
-# cc_library rule.
-haskell_library(
-    name = "intermediate-library-other",
-    srcs = ["IntLib.hsc"],
-    tags = ["requires_zlib"],
-    deps = [
-        ":zlib-with-genrule-header",
-        "//tests/hackage:base",
-        "@zlib.dev//:zlib",
-    ],
-)
-
-haskell_library(
-    name = "library-with-sysincludes-other",
-    srcs = [
-        "Lib.hs",
-        "TH.hs",
-    ],
-    tags = ["requires_zlib"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":intermediate-library-other",
-        "//tests/hackage:base",
-        "//tests/hackage:template-haskell",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/library-with-sysincludes/IntLib.hsc b/third_party/bazel/rules_haskell/tests/library-with-sysincludes/IntLib.hsc
deleted file mode 100644
index cf31e3d9a844..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-sysincludes/IntLib.hsc
+++ /dev/null
@@ -1,15 +0,0 @@
-{-# LANGUAGE CPP #-}
-
-module IntLib (crc) where
-
-import Foreign.Ptr
-import Foreign.C.Types
-
-#include <zlib.h>
-#include "foo.h"
-
-foreign import ccall crc32 :: CLong -> Ptr () -> CInt -> IO ()
-
-crc = crc32 0 nullPtr 0
-
-z = #{size struct gz_header_s}
diff --git a/third_party/bazel/rules_haskell/tests/library-with-sysincludes/Lib.hs b/third_party/bazel/rules_haskell/tests/library-with-sysincludes/Lib.hs
deleted file mode 100644
index 55b1860fdddd..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-sysincludes/Lib.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-
-module Lib (bar) where
-
-import TH (foo)
-
-bar :: IO ()
-bar = $foo
diff --git a/third_party/bazel/rules_haskell/tests/library-with-sysincludes/TH.hs b/third_party/bazel/rules_haskell/tests/library-with-sysincludes/TH.hs
deleted file mode 100644
index 45929ec84040..000000000000
--- a/third_party/bazel/rules_haskell/tests/library-with-sysincludes/TH.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-
-module TH (foo) where
-
-import IntLib (crc)
-import Language.Haskell.TH
-
-foo :: Q Exp
-foo = [| crc |]
diff --git a/third_party/bazel/rules_haskell/tests/multi_repl/BUILD.bazel b/third_party/bazel/rules_haskell/tests/multi_repl/BUILD.bazel
deleted file mode 100644
index b2edce37ab0f..000000000000
--- a/third_party/bazel/rules_haskell/tests/multi_repl/BUILD.bazel
+++ /dev/null
@@ -1,16 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_repl",
-)
-
-haskell_repl(
-    name = "c_only_repl",
-    # To only load :c by source.
-    experimental_from_source = ["//tests/multi_repl/bc:c"],
-    deps = ["//tests/multi_repl/bc:c"],
-)
-
-haskell_repl(
-    name = "c_multi_repl",
-    deps = ["//tests/multi_repl/bc:c"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/multi_repl/a/BUILD.bazel b/third_party/bazel/rules_haskell/tests/multi_repl/a/BUILD.bazel
deleted file mode 100644
index 7d17e834a9cd..000000000000
--- a/third_party/bazel/rules_haskell/tests/multi_repl/a/BUILD.bazel
+++ /dev/null
@@ -1,17 +0,0 @@
-package(default_visibility = ["//visibility:public"])
-
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-haskell_library(
-    name = "a",
-    srcs = [
-        "src/A/A.hs",
-    ],
-    src_strip_prefix = "src",
-    deps = [
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/multi_repl/a/src/A/A.hs b/third_party/bazel/rules_haskell/tests/multi_repl/a/src/A/A.hs
deleted file mode 100644
index 92eb0e60759a..000000000000
--- a/third_party/bazel/rules_haskell/tests/multi_repl/a/src/A/A.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module A.A ( a ) where
-
-a :: ()
-a = ()
diff --git a/third_party/bazel/rules_haskell/tests/multi_repl/bc/BUILD.bazel b/third_party/bazel/rules_haskell/tests/multi_repl/bc/BUILD.bazel
deleted file mode 100644
index 98372a4a1925..000000000000
--- a/third_party/bazel/rules_haskell/tests/multi_repl/bc/BUILD.bazel
+++ /dev/null
@@ -1,30 +0,0 @@
-package(default_visibility = ["//visibility:public"])
-
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-haskell_library(
-    name = "b",
-    srcs = [
-        "src/BC/B.hs",
-    ],
-    src_strip_prefix = "src",
-    deps = [
-        "//tests/hackage:base",
-        "//tests/multi_repl/a",
-    ],
-)
-
-haskell_library(
-    name = "c",
-    srcs = [
-        "src/BC/C.hs",
-    ],
-    src_strip_prefix = "src",
-    deps = [
-        ":b",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/multi_repl/bc/src/BC/B.hs b/third_party/bazel/rules_haskell/tests/multi_repl/bc/src/BC/B.hs
deleted file mode 100644
index b86223c41ea7..000000000000
--- a/third_party/bazel/rules_haskell/tests/multi_repl/bc/src/BC/B.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module BC.B ( b ) where
-
-import A.A ( a )
-
-b :: ()
-b = a
diff --git a/third_party/bazel/rules_haskell/tests/multi_repl/bc/src/BC/C.hs b/third_party/bazel/rules_haskell/tests/multi_repl/bc/src/BC/C.hs
deleted file mode 100644
index 6e6f31f0c80a..000000000000
--- a/third_party/bazel/rules_haskell/tests/multi_repl/bc/src/BC/C.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module BC.C ( c ) where
-
-import BC.B ( b )
-
-c :: ()
-c = b
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/BUILD.bazel b/third_party/bazel/rules_haskell/tests/package-id-clash-binary/BUILD.bazel
deleted file mode 100644
index d64a8909c5f5..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/BUILD.bazel
+++ /dev/null
@@ -1,15 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-    "haskell_toolchain_library",
-)
-
-haskell_test(
-    name = "bin",
-    srcs = ["Main.hs"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/package-id-clash-binary/a:foo",
-        "//tests/package-id-clash-binary/b:foo",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/Main.hs b/third_party/bazel/rules_haskell/tests/package-id-clash-binary/Main.hs
deleted file mode 100644
index 0c341e6f47d2..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/Main.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main where
-
-import Foo
-import Baz
-
-main = print $ x + y
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/a/BUILD.bazel b/third_party/bazel/rules_haskell/tests/package-id-clash-binary/a/BUILD.bazel
deleted file mode 100644
index 02c3a6b36d3f..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/a/BUILD.bazel
+++ /dev/null
@@ -1,12 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_toolchain_library",
-)
-
-haskell_library(
-    name = "foo",
-    srcs = ["Foo.hs"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/a/Foo.hs b/third_party/bazel/rules_haskell/tests/package-id-clash-binary/a/Foo.hs
deleted file mode 100644
index ecac0701a07d..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/a/Foo.hs
+++ /dev/null
@@ -1,3 +0,0 @@
-module Foo where
-
-x = 2
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/b/BUILD.bazel b/third_party/bazel/rules_haskell/tests/package-id-clash-binary/b/BUILD.bazel
deleted file mode 100644
index 4bf734af5dd1..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/b/BUILD.bazel
+++ /dev/null
@@ -1,12 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_toolchain_library",
-)
-
-haskell_library(
-    name = "foo",
-    srcs = ["Baz.hs"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/b/Baz.hs b/third_party/bazel/rules_haskell/tests/package-id-clash-binary/b/Baz.hs
deleted file mode 100644
index 3159fda6b00a..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash-binary/b/Baz.hs
+++ /dev/null
@@ -1,3 +0,0 @@
-module Baz where
-
-y = 2
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash/BUILD.bazel b/third_party/bazel/rules_haskell/tests/package-id-clash/BUILD.bazel
deleted file mode 100644
index 9c1b91cf9b83..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash/BUILD.bazel
+++ /dev/null
@@ -1,24 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "sublib",
-    srcs = ["Foo.hs"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_library(
-    name = "lib",
-    srcs = ["Baz.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":sublib",
-        "//tests/hackage:base",
-        "//tests/package-id-clash/sublib",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash/Baz.hs b/third_party/bazel/rules_haskell/tests/package-id-clash/Baz.hs
deleted file mode 100644
index 718a2dd99241..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash/Baz.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module Baz (baz) where
-
-import Foo (foo)
-import Bar (bar)
-
-baz :: Int
-baz = foo + bar
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash/Foo.hs b/third_party/bazel/rules_haskell/tests/package-id-clash/Foo.hs
deleted file mode 100644
index f325b2efcfbb..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash/Foo.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Foo (foo) where
-
-foo :: Int
-foo = 5
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash/sublib/BUILD.bazel b/third_party/bazel/rules_haskell/tests/package-id-clash/sublib/BUILD.bazel
deleted file mode 100644
index e5d277c2a254..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash/sublib/BUILD.bazel
+++ /dev/null
@@ -1,13 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "sublib",
-    srcs = ["Bar.hs"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/package-id-clash/sublib/Bar.hs b/third_party/bazel/rules_haskell/tests/package-id-clash/sublib/Bar.hs
deleted file mode 100644
index 6fbd9711f58b..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-id-clash/sublib/Bar.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Bar (bar) where
-
-bar :: Int
-bar = 6
diff --git a/third_party/bazel/rules_haskell/tests/package-name/BUILD.bazel b/third_party/bazel/rules_haskell/tests/package-name/BUILD.bazel
deleted file mode 100644
index 9d187f083636..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-name/BUILD.bazel
+++ /dev/null
@@ -1,28 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-# Tests around our use of package names.
-package(default_testonly = 1)
-
-haskell_library(
-    # The character "Z" should be untouched in the GHC package name.
-    # However, underscores (which are not legal) should be turned into dashes.
-    name = "lib-a_Z",
-    srcs = ["Lib.hs"],
-    version = "1.2.3.4",
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_test(
-    name = "bin",
-    size = "small",
-    srcs = ["Main.hs"],
-    version = "0.0.0",  # This flags triggers the `MIN_VERSION` macro generation
-    deps = [
-        ":lib-a_Z",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/package-name/Lib.hs b/third_party/bazel/rules_haskell/tests/package-name/Lib.hs
deleted file mode 100644
index e5e06b414ba0..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-name/Lib.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-{-# LANGUAGE CPP #-}
-module Lib (foo, libPackageKey) where
-
-foo :: Integer
-foo = 42
-
-libPackageKey :: String
-libPackageKey = CURRENT_PACKAGE_KEY
diff --git a/third_party/bazel/rules_haskell/tests/package-name/Main.hs b/third_party/bazel/rules_haskell/tests/package-name/Main.hs
deleted file mode 100644
index b1e73dcbf716..000000000000
--- a/third_party/bazel/rules_haskell/tests/package-name/Main.hs
+++ /dev/null
@@ -1,33 +0,0 @@
-{-# LANGUAGE CPP #-}
-{-# LANGUAGE PackageImports #-}
-module Main (main) where
-
-import Control.Monad (when)
-
--- Test the PackageImports extension.
-import "lib-a-Z" Lib
-
--- Test macros that GHC creates automatically based on the package version.
-versionHighEnoughTest, versionTooLowTest :: Bool
-#if MIN_VERSION_lib_a_Z(1,2,3)
-versionHighEnoughTest = True
-#else
-versionHighEnoughTest = False
-#endif
-
-#if MIN_VERSION_lib_a_Z(1,2,4)
-versionTooLowTest = False
-#else
-versionTooLowTest = True
-#endif
-
-check :: (Show a, Eq a) => a -> a -> IO ()
-check x y = when (x /= y) $ error $ "Failed check: " ++ show (x, y)
-
-main :: IO ()
-main = do
-    check foo 42
-    check VERSION_lib_a_Z "1.2.3.4"
-    check libPackageKey "testsZSpackage-nameZSlib-a-ZZ"
-    check versionHighEnoughTest True
-    check versionTooLowTest True
diff --git a/third_party/bazel/rules_haskell/tests/repl-flags/BUILD.bazel b/third_party/bazel/rules_haskell/tests/repl-flags/BUILD.bazel
deleted file mode 100644
index 8fd099dc4d12..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-flags/BUILD.bazel
+++ /dev/null
@@ -1,45 +0,0 @@
-load("@io_tweag_rules_haskell//haskell:haskell.bzl", "haskell_test")
-
-package(default_testonly = 1)
-
-# This test the `compiler` flags in many ways:
-# - the test needs to be built with `-DTESTS_TOOLCHAIN_COMPILER_FLAGS`, provided by the toolchain attribute `compiler_flags`
-# - the test needs `-XOverloadedStrings`, provided by this rule `compiler_flags`
-# - toolchain and rule `compiler_flags` are additive, else one of the previous test will fail
-# - the ordering is as such as rule flags are more important that toolchain flags
-
-# This rule must build correctly (using `bazel build`), but also as a repl (using `bazel run //tests/repl-flags:compiler_flags@repl`)
-haskell_test(
-    name = "compiler_flags",
-    srcs = ["CompilerFlags.hs"],
-
-    # This also ensure that local `compiler_flags` does not override the `global ones`
-    compiler_flags = ["-XOverloadedStrings"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:bytestring",
-    ],
-)
-
-# This test the `repl_ghci_args` flags in a similar way
-# - the test needs to be built with `-DTESTS_TOOLCHAIN_REPL_FLAGS`, provided by the toolchain attribute `compiler_flags`
-# - the test needs `-XOverloadedStrings`, provided by toolchain `repl_ghci_args`
-# - toolchain and rule `compiler_flags` are additive, else one of the previous test will fail
-# - the ordering is as such as rule flags are more important that
-#    toolchain flags and that repl flags are more important that
-#    copmiler flags
-
-# This rule must build correctly (using `bazel build`), but also as a repl (using `bazel run //tests/repl-flags:compiler_flags@repl`). The final result between the repl and the binary must be different
-haskell_test(
-    name = "repl_flags",
-    srcs = ["ReplFlags.hs"],
-
-    # This also ensure that local `repl_flags` does not override the `global ones`
-    repl_ghci_args = ["-DTESTS_TOOLCHAIN_REPL_FLAGS"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:bytestring",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/repl-flags/CompilerFlags.hs b/third_party/bazel/rules_haskell/tests/repl-flags/CompilerFlags.hs
deleted file mode 100644
index 5470fe11b57c..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-flags/CompilerFlags.hs
+++ /dev/null
@@ -1,10 +0,0 @@
-{-# LANGUAGE CPP #-}
-
-module Main where
-
-import Data.ByteString
-
-#ifdef TESTS_TOOLCHAIN_COMPILER_FLAGS
-main = print ("hello" :: ByteString)
-#endif
-
diff --git a/third_party/bazel/rules_haskell/tests/repl-flags/ReplFlags.hs b/third_party/bazel/rules_haskell/tests/repl-flags/ReplFlags.hs
deleted file mode 100644
index 137ec93a72f4..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-flags/ReplFlags.hs
+++ /dev/null
@@ -1,17 +0,0 @@
-{-# LANGUAGE CPP #-}
-module Main where
-
-import Data.ByteString
-
--- Ensure that `compiler-flags` are correctly set
-#ifdef TESTS_TOOLCHAIN_COMPILER_FLAGS
-main = print "hello"
-#endif
-
--- Ensure that `repl_ghci_args` are correctly set
--- OverloadedString is passed by toolchain
--- The CPP constant is unset by toolchain and set by rule, so ordering must be ensured
-#ifdef TESTS_TOOLCHAIN_REPL_FLAGS
-foo = ("world" :: ByteString)
-#endif
-
diff --git a/third_party/bazel/rules_haskell/tests/repl-name-conflicts/BUILD.bazel b/third_party/bazel/rules_haskell/tests/repl-name-conflicts/BUILD.bazel
deleted file mode 100644
index ea2366cf3e08..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-name-conflicts/BUILD.bazel
+++ /dev/null
@@ -1,15 +0,0 @@
-load("@io_tweag_rules_haskell//haskell:haskell.bzl", "haskell_library")
-
-package(default_testonly = 1)
-
-# The module in this library hides a lot of identifiers from Prelude and other
-# modules used in the repl init script.
-# This shouldn't break the @repl target
-haskell_library(
-    name = "lib",
-    srcs = ["PreludeShadowing.hs"],
-    deps = [
-        "//tests/hackage:base",
-        "//tests/hackage:bytestring",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/repl-name-conflicts/PreludeShadowing.hs b/third_party/bazel/rules_haskell/tests/repl-name-conflicts/PreludeShadowing.hs
deleted file mode 100644
index 02ecd02684ba..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-name-conflicts/PreludeShadowing.hs
+++ /dev/null
@@ -1,12 +0,0 @@
-{-# LANGUAGE NoImplicitPrelude #-}
-{-# LANGUAGE OverloadedStrings #-}
-
-module PreludeShadowing where
-
-import           Data.ByteString
-
-(>>=) :: ByteString -> ByteString -> ByteString
-_ >>= _ = "blah"
-
-stdin :: ByteString
-stdin = "stdin"
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/BUILD.bazel b/third_party/bazel/rules_haskell/tests/repl-targets/BUILD.bazel
deleted file mode 100644
index 2fd78bfd6621..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/BUILD.bazel
+++ /dev/null
@@ -1,81 +0,0 @@
-load("@io_tweag_rules_haskell//haskell:c2hs.bzl", "c2hs_library")
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-genrule(
-    name = "codegen",
-    outs = [
-        "Gen.hs",
-    ],
-    cmd = """
-  echo "module Gen (gen) where" >> $(location :Gen.hs)
-  echo "gen :: String" >> $(location :Gen.hs)
-  echo "gen = \\"gen\\"" >> $(location :Gen.hs)
-""",
-)
-
-c2hs_library(
-    name = "chs",
-    srcs = ["Chs.chs"],
-    tags = ["requires_c2hs"],
-)
-
-haskell_library(
-    name = "hs-lib",
-    srcs = [
-        "Foo.hs",
-        "Hsc.hsc",
-        ":chs",
-        ":codegen",
-    ],
-    tags = [
-        "requires_hackage",
-        "requires_zlib",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/data:ourclibrary",
-        "//tests/hackage:array",
-        "//tests/hackage:base",
-        "@zlib",
-    ],
-)
-
-haskell_library(
-    name = "hs-lib-bad",
-    srcs = [
-        "Bad.hs",
-    ],
-    tags = [
-        "manual",
-        "requires_zlib",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//tests/data:ourclibrary",
-        "//tests/hackage:base",
-        "@hackage//:array",
-        "@zlib",
-    ],
-)
-
-haskell_library(
-    name = "QuuxLib",
-    srcs = ["QuuxLib.hs"],
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_test(
-    name = "hs-bin",
-    srcs = ["Quux.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        ":QuuxLib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/Bad.hs b/third_party/bazel/rules_haskell/tests/repl-targets/Bad.hs
deleted file mode 100644
index 2889be2ba757..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/Bad.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Bad
-  ( bad )
-where
-
-bad :: Into
-bad = "foo"
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/Chs.chs b/third_party/bazel/rules_haskell/tests/repl-targets/Chs.chs
deleted file mode 100644
index c66bae7d60fd..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/Chs.chs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Chs
-  ( baz )
-where
-
-baz :: String
-baz = "baz"
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/Foo.hs b/third_party/bazel/rules_haskell/tests/repl-targets/Foo.hs
deleted file mode 100644
index 5e5138418d5d..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/Foo.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
-
-module Foo (foo) where
-
-foreign import ccall "c_add_one"
-  c_add_one :: Int -> Int
-
-foo :: Int -> Int
-foo = (+ 5) . c_add_one
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/Hsc.hsc b/third_party/bazel/rules_haskell/tests/repl-targets/Hsc.hsc
deleted file mode 100644
index d4e3d6605c00..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/Hsc.hsc
+++ /dev/null
@@ -1,8 +0,0 @@
-module Hsc
-  ( bar )
-where
-
-#ifndef _INTERNAL_HSC_DO_NOT_DEFINE_ME
-bar :: String
-bar = "bar"
-#endif
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/Quux.hs b/third_party/bazel/rules_haskell/tests/repl-targets/Quux.hs
deleted file mode 100644
index 2e67d221fb22..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/Quux.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main (main) where
-
-import QuuxLib (message)
-
-main :: IO ()
-main = putStrLn message
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/QuuxLib.hs b/third_party/bazel/rules_haskell/tests/repl-targets/QuuxLib.hs
deleted file mode 100644
index d321de2adda3..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/QuuxLib.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module QuuxLib (message) where
-
-message :: String
-message = "Hello GHCi!"
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/src/Bar.hs b/third_party/bazel/rules_haskell/tests/repl-targets/src/Bar.hs
deleted file mode 100644
index 18fe359e0a2a..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/src/Bar.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Bar (bar) where
-
-bar :: Int
-bar = 4
diff --git a/third_party/bazel/rules_haskell/tests/repl-targets/src/Baz.hsc b/third_party/bazel/rules_haskell/tests/repl-targets/src/Baz.hsc
deleted file mode 100644
index 984ec4ff0ad9..000000000000
--- a/third_party/bazel/rules_haskell/tests/repl-targets/src/Baz.hsc
+++ /dev/null
@@ -1,4 +0,0 @@
-module Baz (baz) where
-
-baz :: Int
-baz = 8
diff --git a/third_party/bazel/rules_haskell/tests/rule_test_exe.bzl b/third_party/bazel/rules_haskell/tests/rule_test_exe.bzl
deleted file mode 100644
index fdecbb385871..000000000000
--- a/third_party/bazel/rules_haskell/tests/rule_test_exe.bzl
+++ /dev/null
@@ -1,14 +0,0 @@
-load("@bazel_tools//tools/build_rules:test_rules.bzl", "rule_test")
-
-def rule_test_exe(generates, **kwargs):
-    """
-        Like 'rule_test' but appends ".exe" to the elements of
-        "generates".
-    """
-
-    new_generates = select({
-        "@bazel_tools//src/conditions:windows": [e + ".exe" for e in generates],
-        "//conditions:default": generates,
-    })
-
-    rule_test(generates = new_generates, **kwargs)
diff --git a/third_party/bazel/rules_haskell/tests/run-start-script.sh b/third_party/bazel/rules_haskell/tests/run-start-script.sh
deleted file mode 100755
index 6803581f0010..000000000000
--- a/third_party/bazel/rules_haskell/tests/run-start-script.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/bin/sh
-
-# Run the start script in its own workspace
-# and build the example binary target.
-
-set -e
-
-pwd=$(pwd)
-cd $(mktemp -d)
-$pwd/start
-
-# Copy the bazel configuration, this is only useful for CI
-mkdir tools
-cp $pwd/.bazelrc .bazelrc
-
-# Set Nixpkgs in environment variable to avoid hardcoding it in
-# start script itself.
-
-# overrides the used rules_haskell, because
-# when we're testing the start on a feature branch (CI),
-# the latest rules_haskell version doesn't always work.
-# If on the branch we update Bazel to a version with breaking
-# changes, then we need to adapt to those changes in the branch.
-# Which in turn means the start script should pull in those changes too.
-
-NIX_PATH=nixpkgs=$pwd/nixpkgs/default.nix \
-  bazel build \
-  --config=ci \
-  --override_repository=io_tweag_rules_haskell=$pwd \
-  //:example
diff --git a/third_party/bazel/rules_haskell/tests/scripts/exec.sh b/third_party/bazel/rules_haskell/tests/scripts/exec.sh
deleted file mode 100755
index 2a6c2a810041..000000000000
--- a/third_party/bazel/rules_haskell/tests/scripts/exec.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-set -e
-
-exec "$1"
diff --git a/third_party/bazel/rules_haskell/tests/textual-hdrs/BUILD.bazel b/third_party/bazel/rules_haskell/tests/textual-hdrs/BUILD.bazel
deleted file mode 100644
index e66f497c77f2..000000000000
--- a/third_party/bazel/rules_haskell/tests/textual-hdrs/BUILD.bazel
+++ /dev/null
@@ -1,17 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_test",
-)
-
-package(default_testonly = 1)
-
-haskell_test(
-    name = "textual-hdrs",
-    srcs = [
-        "Main.hs",
-        "include/main_definition.h",
-    ],
-    compiler_flags = ["-Itests/textual-hdrs/include"],
-    visibility = ["//visibility:public"],
-    deps = ["//tests/hackage:base"],
-)
diff --git a/third_party/bazel/rules_haskell/tests/textual-hdrs/Main.hs b/third_party/bazel/rules_haskell/tests/textual-hdrs/Main.hs
deleted file mode 100644
index f741091275d8..000000000000
--- a/third_party/bazel/rules_haskell/tests/textual-hdrs/Main.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-{-# LANGUAGE CPP #-}
-
-module Main (main) where
-
-#include "main_definition.h"
diff --git a/third_party/bazel/rules_haskell/tests/textual-hdrs/include/main_definition.h b/third_party/bazel/rules_haskell/tests/textual-hdrs/include/main_definition.h
deleted file mode 100644
index 071eeddd8706..000000000000
--- a/third_party/bazel/rules_haskell/tests/textual-hdrs/include/main_definition.h
+++ /dev/null
@@ -1,2 +0,0 @@
-main :: IO ()
-main = putStrLn "extras-included-during-comp"
diff --git a/third_party/bazel/rules_haskell/tests/two-libs/BUILD.bazel b/third_party/bazel/rules_haskell/tests/two-libs/BUILD.bazel
deleted file mode 100644
index d69dba515c2d..000000000000
--- a/third_party/bazel/rules_haskell/tests/two-libs/BUILD.bazel
+++ /dev/null
@@ -1,42 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-
-package(
-    default_testonly = 1,
-    default_visibility = ["//visibility:public"],
-)
-
-haskell_library(
-    name = "one",
-    srcs = ["One.hs"],
-    deps = [
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_library(
-    name = "two",
-    srcs = ["Two.hs"],
-    deps = [
-        ":one",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_test(
-    name = "two-libs",
-    srcs = ["Main.hs"],
-    coverage_report_format = "html",
-    expected_covered_expressions_percentage = 55,
-    expected_uncovered_expression_count = 4,
-    experimental_coverage_source_patterns = [":two"],
-    strict_coverage_analysis = True,
-    tags = ["coverage-compatible"],
-    deps = [
-        ":two",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/two-libs/Main.hs b/third_party/bazel/rules_haskell/tests/two-libs/Main.hs
deleted file mode 100644
index 99ce449a5281..000000000000
--- a/third_party/bazel/rules_haskell/tests/two-libs/Main.hs
+++ /dev/null
@@ -1,6 +0,0 @@
-module Main where
-
-import Two (two)
-
-main :: IO ()
-main = putStrLn ("Two: " ++ show two)
diff --git a/third_party/bazel/rules_haskell/tests/two-libs/One.hs b/third_party/bazel/rules_haskell/tests/two-libs/One.hs
deleted file mode 100644
index f8f04ab2640c..000000000000
--- a/third_party/bazel/rules_haskell/tests/two-libs/One.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module One (one) where
-
-one :: Int
-one = 1
diff --git a/third_party/bazel/rules_haskell/tests/two-libs/Two.hs b/third_party/bazel/rules_haskell/tests/two-libs/Two.hs
deleted file mode 100644
index 5672263c3d5f..000000000000
--- a/third_party/bazel/rules_haskell/tests/two-libs/Two.hs
+++ /dev/null
@@ -1,14 +0,0 @@
-module Two (two) where
-
-import One (one)
-
-two :: Int
-two = 
-    if True then
-        one + one
-    else 
-        if True then
-            1
-        else
-            2
-    
\ No newline at end of file
diff --git a/third_party/bazel/rules_haskell/tests/unit-tests/BUILD.bazel b/third_party/bazel/rules_haskell/tests/unit-tests/BUILD.bazel
deleted file mode 100644
index 990035af685f..000000000000
--- a/third_party/bazel/rules_haskell/tests/unit-tests/BUILD.bazel
+++ /dev/null
@@ -1,125 +0,0 @@
-load(
-    ":tests.bzl",
-    "create_rpath_entry_test",
-    "dedup_on_test",
-    "parent_dir_path_test",
-)
-
-parent_dir_path_test(
-    name = "parent_dir_just_file",
-    filename = "foo",
-    output = ["."],
-)
-
-parent_dir_path_test(
-    name = "parent_dir",
-    filename = "foo/",
-    output = ["foo"],
-)
-
-parent_dir_path_test(
-    name = "parent_dir_file",
-    filename = "foo/bar",
-    output = ["foo"],
-)
-
-parent_dir_path_test(
-    name = "parent_dir_file_dots",
-    filename = "foo/../bar",
-    output = [
-        "foo",
-        "..",
-    ],
-)
-
-parent_dir_path_test(
-    name = "parent_dir_rooted",
-    filename = "/foo/bar",
-    output = [
-        "",
-        "foo",
-    ],
-)
-
-create_rpath_entry_test(
-    name = "rpath_entry_simple",
-    binary_short_path = "foo/a.so",
-    dependency_short_path = "bar/b.so",
-    output = "../bar",
-)
-
-# checks that a binary in //:bin works properly
-create_rpath_entry_test(
-    name = "rpath_entry_binary_root",
-    binary_short_path = "bin",
-    dependency_short_path = "xyz/b.so",
-    output = "xyz",
-)
-
-# same for dependency
-create_rpath_entry_test(
-    name = "rpath_entry_dep_root",
-    binary_short_path = "lib/bin",
-    dependency_short_path = "b.so",
-    output = "..",
-)
-
-create_rpath_entry_test(
-    name = "rpath_entry_simple_filename",
-    binary_short_path = "foo/a.so",
-    dependency_short_path = "bar/b.so",
-    keep_filename = True,
-    output = "../bar/b.so",
-)
-
-create_rpath_entry_test(
-    name = "rpath_entry_prefix",
-    binary_short_path = "foo/a.so",
-    dependency_short_path = "bar/b.so",
-    output = "$ORIGIN/../bar",
-    prefix = "$ORIGIN",
-)
-
-# if the short-paths have leading dots, they are in `external`
-
-create_rpath_entry_test(
-    name = "rpath_entry_binary_leading_dots_dep",
-    # non-external
-    binary_short_path = "foo/a.so",
-    # external dep
-    dependency_short_path = "../bar/b.so",
-    output = "../external/bar",
-)
-
-create_rpath_entry_test(
-    name = "rpath_entry_binary_leading_dots_bin",
-    # external dep
-    binary_short_path = "../foo/a.so",
-    # non-external
-    dependency_short_path = "bar/b.so",
-    # back through `external`
-    output = "../../bar",
-)
-
-create_rpath_entry_test(
-    name = "rpath_entry_binary_leading_dots_both",
-    # external dep
-    binary_short_path = "../foo/a.so",
-    # external dep
-    dependency_short_path = "../bar/b.so",
-    # stay in `external`
-    output = "../bar",
-)
-
-# we have no idea how to handle internal dots, should they arise
-# create_rpath_entry_test(
-#     name = "rpath_entry_binary_internal_dots",
-#     binary_short_path = "foo/../../a.so",
-#     dependency_short_path = "../bar/../b.so",
-#     # but that doesn’t change anything for the runpath
-#     output = "../bar",
-# )
-
-dedup_on_test(
-    name = "dedup_on_test",
-)
diff --git a/third_party/bazel/rules_haskell/tests/unit-tests/tests.bzl b/third_party/bazel/rules_haskell/tests/unit-tests/tests.bzl
deleted file mode 100644
index 58a3f400adbe..000000000000
--- a/third_party/bazel/rules_haskell/tests/unit-tests/tests.bzl
+++ /dev/null
@@ -1,83 +0,0 @@
-load(
-    "@bazel_skylib//lib:unittest.bzl",
-    "asserts",
-    unit = "unittest",
-)
-load("//haskell:private/actions/link.bzl", "create_rpath_entry", "parent_dir_path")
-load("//haskell:private/list.bzl", "list")
-
-def parent_dir_path_test_impl(ctx):
-    env = unit.begin(ctx)
-    asserts.equals(
-        env,
-        expected = ctx.attr.output,
-        actual = parent_dir_path(ctx.attr.filename),
-    )
-    unit.end(env)
-
-parent_dir_path_test = unit.make(
-    parent_dir_path_test_impl,
-    attrs = {
-        "filename": attr.string(),
-        "output": attr.string_list(),
-    },
-)
-
-def create_rpath_entry_test_impl(ctx):
-    env = unit.begin(ctx)
-    asserts.equals(
-        env,
-        expected = ctx.attr.output,
-        actual = create_rpath_entry(
-            struct(
-                short_path = ctx.attr.binary_short_path,
-            ),
-            struct(
-                short_path = ctx.attr.dependency_short_path,
-            ),
-            keep_filename = ctx.attr.keep_filename,
-            prefix = ctx.attr.prefix,
-        ),
-    )
-    unit.end(env)
-
-create_rpath_entry_test = unit.make(
-    create_rpath_entry_test_impl,
-    attrs = {
-        "binary_short_path": attr.string(),
-        "dependency_short_path": attr.string(),
-        "keep_filename": attr.bool(default = False, mandatory = False),
-        "prefix": attr.string(default = "", mandatory = False),
-        "output": attr.string(),
-    },
-)
-
-def compare_x(el):
-    return el.x
-
-def dedup_on_test_impl(ctx):
-    env = unit.begin(ctx)
-    asserts.equals(
-        env,
-        expected = [],
-        actual = list.dedup_on(compare_x, []),
-    )
-    asserts.equals(
-        env,
-        expected = [struct(x = 3)],
-        actual = list.dedup_on(
-            compare_x,
-            [struct(x = 3), struct(x = 3), struct(x = 3)],
-        ),
-    )
-    asserts.equals(
-        env,
-        expected = [struct(x = 3), struct(x = 4), struct(x = 5)],
-        actual = list.dedup_on(
-            compare_x,
-            [struct(x = 3), struct(x = 4), struct(x = 3), struct(x = 5), struct(x = 3)],
-        ),
-    )
-    unit.end(env)
-
-dedup_on_test = unit.make(dedup_on_test_impl)
diff --git a/third_party/bazel/rules_haskell/tests/version-macros/BUILD.bazel b/third_party/bazel/rules_haskell/tests/version-macros/BUILD.bazel
deleted file mode 100644
index b2be1b7d1598..000000000000
--- a/third_party/bazel/rules_haskell/tests/version-macros/BUILD.bazel
+++ /dev/null
@@ -1,59 +0,0 @@
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-    "haskell_test",
-)
-load(
-    "@io_tweag_rules_haskell//haskell:c2hs.bzl",
-    "c2hs_library",
-)
-
-package(default_testonly = 1)
-
-haskell_library(
-    name = "versioned-lib",
-    srcs = ["VersionedLib.hs"],
-    version = "1.2.3.4",
-    deps = ["//tests/hackage:base"],
-)
-
-haskell_test(
-    name = "version_macros",
-    size = "small",
-    srcs = [
-        "HsLib.hs",
-        "HscLib.hsc",
-        "Main.hs",
-    ],
-    version = "3.4.5.6",
-    deps = [
-        ":versioned-lib",
-        "//tests/hackage:base",
-    ],
-)
-
-c2hs_library(
-    name = "c2hs-lib",
-    srcs = ["C2hsLib.chs"],
-    tags = ["requires_c2hs"],
-    version = "4.5.6.7",
-    deps = [
-        ":versioned-lib",
-        "//tests/hackage:base",
-    ],
-)
-
-haskell_test(
-    name = "version_macros_c2hs",
-    size = "small",
-    srcs = [
-        "MainC2hs.hs",
-        ":c2hs-lib",
-    ],
-    tags = ["requires_c2hs"],
-    version = "4.5.6.7",
-    deps = [
-        ":versioned-lib",
-        "//tests/hackage:base",
-    ],
-)
diff --git a/third_party/bazel/rules_haskell/tests/version-macros/C2hsLib.chs b/third_party/bazel/rules_haskell/tests/version-macros/C2hsLib.chs
deleted file mode 100644
index 4b484af2a3ed..000000000000
--- a/third_party/bazel/rules_haskell/tests/version-macros/C2hsLib.chs
+++ /dev/null
@@ -1,44 +0,0 @@
-module C2hsLib where
-
-import Control.Monad (unless)
-
-check_version_versioned_lib :: IO ()
-#ifndef VERSION_versioned_lib
-check_version_versioned_lib = fail "c2hs: VERSION_versioned_lib missing"
-#else
-check_version_versioned_lib =
-  unless ({#const VERSION_versioned_lib#} == "1.2.3.4") $
-    fail "c2hs: VERSION_versioned_lib invalid"
-#endif
-
-check_min_version_versioned_lib :: IO ()
-#ifndef MIN_VERSION_versioned_lib
-check_min_version_versioned_lib = fail "c2hs: MIN_VERSION_versioned_lib missing"
-#elif !MIN_VERSION_versioned_lib(1,2,3)
-check_min_version_versioned_lib = fail "c2hs: MIN_VERSION_versioned_lib invalid"
-#else
-check_min_version_versioned_lib = pure ()
-#endif
-
-check_version_base :: IO ()
-#ifndef VERSION_base
-check_version_base = fail "c2hs: VERSION_base missing"
-#else
-check_version_base = pure ()
-#endif
-
-check_min_version_base :: IO ()
-#ifndef MIN_VERSION_base
-check_min_version_base = fail "c2hs: MIN_VERSION_base missing"
-#elif !MIN_VERSION_base(0,0,0)
-check_min_version_base = fail "c2hs: MIN_VERSION_base invalid"
-#else
-check_min_version_base = pure ()
-#endif
-
-check :: IO ()
-check = do
-  check_version_versioned_lib
-  check_min_version_versioned_lib
-  check_version_base
-  check_min_version_base
diff --git a/third_party/bazel/rules_haskell/tests/version-macros/HsLib.hs b/third_party/bazel/rules_haskell/tests/version-macros/HsLib.hs
deleted file mode 100644
index ce61906c81e6..000000000000
--- a/third_party/bazel/rules_haskell/tests/version-macros/HsLib.hs
+++ /dev/null
@@ -1,46 +0,0 @@
-{-# LANGUAGE CPP #-}
-
-module HsLib where
-
-import Control.Monad (unless)
-
-check_version_versioned_lib :: IO ()
-#ifndef VERSION_versioned_lib
-check_version_versioned_lib = fail "hs: VERSION_versioned_lib missing"
-#else
-check_version_versioned_lib =
-  unless (VERSION_versioned_lib == "1.2.3.4") $
-    fail "hs: VERSION_versioned_lib invalid"
-#endif
-
-check_min_version_versioned_lib :: IO ()
-#ifndef MIN_VERSION_versioned_lib
-check_min_version_versioned_lib = fail "hs: MIN_VERSION_versioned_lib missing"
-#elif !MIN_VERSION_versioned_lib(1,2,3)
-check_min_version_versioned_lib = fail "hs: MIN_VERSION_versioned_lib invalid"
-#else
-check_min_version_versioned_lib = pure ()
-#endif
-
-check_version_base :: IO ()
-#ifndef VERSION_base
-check_version_base = fail "hs: VERSION_base missing"
-#else
-check_version_base = pure ()
-#endif
-
-check_min_version_base :: IO ()
-#ifndef MIN_VERSION_base
-check_min_version_base = fail "hs: MIN_VERSION_base missing"
-#elif !MIN_VERSION_base(0,0,0)
-check_min_version_base = fail "hs: MIN_VERSION_base invalid"
-#else
-check_min_version_base = pure ()
-#endif
-
-check :: IO ()
-check = do
-  check_version_versioned_lib
-  check_min_version_versioned_lib
-  check_version_base
-  check_min_version_base
diff --git a/third_party/bazel/rules_haskell/tests/version-macros/HscLib.hsc b/third_party/bazel/rules_haskell/tests/version-macros/HscLib.hsc
deleted file mode 100644
index 387e73a08997..000000000000
--- a/third_party/bazel/rules_haskell/tests/version-macros/HscLib.hsc
+++ /dev/null
@@ -1,44 +0,0 @@
-module HscLib where
-
-import Control.Monad (unless)
-
-check_version_versioned_lib :: IO ()
-#ifndef VERSION_versioned_lib
-check_version_versioned_lib = fail "hsc2hs: VERSION_versioned_lib missing"
-#else
-check_version_versioned_lib =
-  unless (#{const_str VERSION_versioned_lib} == "1.2.3.4") $
-    fail "hsc2hs: VERSION_versioned_lib invalid"
-#endif
-
-check_min_version_versioned_lib :: IO ()
-#ifndef MIN_VERSION_versioned_lib
-check_min_version_versioned_lib = fail "hsc2hs: MIN_VERSION_versioned_lib missing"
-#elif !MIN_VERSION_versioned_lib(1,2,3)
-check_min_version_versioned_lib = fail "hsc2hs: MIN_VERSION_versioned_lib invalid"
-#else
-check_min_version_versioned_lib = pure ()
-#endif
-
-check_version_base :: IO ()
-#ifndef VERSION_base
-check_version_base = fail "hsc2hs: VERSION_base missing"
-#else
-check_version_base = pure ()
-#endif
-
-check_min_version_base :: IO ()
-#ifndef MIN_VERSION_base
-check_min_version_base = fail "hsc2hs: MIN_VERSION_base missing"
-#elif !MIN_VERSION_base(0,0,0)
-check_min_version_base = fail "hsc2hs: MIN_VERSION_base invalid"
-#else
-check_min_version_base = pure ()
-#endif
-
-check :: IO ()
-check = do
-  check_version_versioned_lib
-  check_min_version_versioned_lib
-  check_version_base
-  check_min_version_base
diff --git a/third_party/bazel/rules_haskell/tests/version-macros/Main.hs b/third_party/bazel/rules_haskell/tests/version-macros/Main.hs
deleted file mode 100644
index bbcd108d0b6b..000000000000
--- a/third_party/bazel/rules_haskell/tests/version-macros/Main.hs
+++ /dev/null
@@ -1,9 +0,0 @@
-module Main where
-
-import qualified HscLib
-import qualified HsLib
-
-main :: IO ()
-main = do
-  HscLib.check
-  HsLib.check
diff --git a/third_party/bazel/rules_haskell/tests/version-macros/MainC2hs.hs b/third_party/bazel/rules_haskell/tests/version-macros/MainC2hs.hs
deleted file mode 100644
index 82e4ec72e248..000000000000
--- a/third_party/bazel/rules_haskell/tests/version-macros/MainC2hs.hs
+++ /dev/null
@@ -1,7 +0,0 @@
-module Main where
-
-import qualified C2hsLib
-
-main :: IO ()
-main = do
-  C2hsLib.check
diff --git a/third_party/bazel/rules_haskell/tests/version-macros/VersionedLib.hs b/third_party/bazel/rules_haskell/tests/version-macros/VersionedLib.hs
deleted file mode 100644
index 0dfd5577e7aa..000000000000
--- a/third_party/bazel/rules_haskell/tests/version-macros/VersionedLib.hs
+++ /dev/null
@@ -1 +0,0 @@
-module VersionedLib where