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

third_party/bazel/rules_haskell/tests/haskell_test/BUILD.bazel

@@ -0,0 +1,29 @@
+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",
+    ],
+)

third_party/bazel/rules_haskell/tests/haskell_test/Lib.hs

@@ -0,0 +1,4 @@
+module Lib where
+
+foo :: Int
+foo = 42

third_party/bazel/rules_haskell/tests/haskell_test/Test.hs

@@ -0,0 +1,4 @@
+module Test (test) where
+
+test :: IO ()
+test = putStrLn "haskell_test fired"