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

third_party/bazel/rules_haskell/tests/binary-custom-main/BUILD.bazel

@@ -0,0 +1,17 @@
+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"],
+)

third_party/bazel/rules_haskell/tests/binary-custom-main/Main.hs

@@ -0,0 +1,4 @@
+module Main (main) where
+
+main :: IO ()
+main = return ()