feat(third_party/bazel): Check in rules_haskell from Tweag

third_party/bazel/rules_haskell/tests/binary-with-plugin/BUILD.bazel

@@ -0,0 +1,53 @@
+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"],
+)

third_party/bazel/rules_haskell/tests/binary-with-plugin/Main.hs

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+module Main where
+
+main = putStrLn "hello world"

third_party/bazel/rules_haskell/tests/binary-with-plugin/Plugin.hs

@@ -0,0 +1,15 @@
+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