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

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

@@ -0,0 +1,31 @@
+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",
+    ],
+)

third_party/bazel/rules_haskell/tests/binary-with-data/bin1-input

@@ -0,0 +1 @@
+contents

third_party/bazel/rules_haskell/tests/binary-with-data/bin1.hs

@@ -0,0 +1,9 @@
+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

third_party/bazel/rules_haskell/tests/binary-with-data/bin2.hs

@@ -0,0 +1,8 @@
+module Main where
+
+import System.Process (callProcess)
+import System.Environment (getArgs)
+
+main = do
+  [arg] <- getArgs
+  callProcess arg []