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

third_party/bazel/rules_haskell/tests/library-with-includes/BUILD.bazel

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

third_party/bazel/rules_haskell/tests/library-with-includes/Lib.hs

@@ -0,0 +1,8 @@
+{-# 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

third_party/bazel/rules_haskell/tests/library-with-includes/b.h

@@ -0,0 +1 @@
+#define B 17