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

third_party/bazel/rules_haskell/tests/generated-modules/BUILD.bazel

@@ -0,0 +1,56 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+    "haskell_test",
+)
+
+package(
+    default_testonly = 1,
+    default_visibility = ["//visibility:public"],
+)
+
+genrule(
+    name = "generate-genmodule",
+    outs = ["src/GenModule.hs"],
+    cmd = "printf 'module GenModule where\na = 1 :: Int' > $@",
+)
+
+haskell_library(
+    name = "GenModule",
+    srcs = [":generate-genmodule"],
+    src_strip_prefix = "src",
+    deps = ["//tests/hackage:base"],
+)
+
+genrule(
+    name = "generate-binmodule",
+    outs = ["src/BinModule.hs"],
+    cmd = "printf 'module BinModule where\nb = 2 :: Int' > $@",
+    output_to_bindir = 1,
+)
+
+haskell_library(
+    name = "BinModule",
+    srcs = [":generate-binmodule"],
+    src_strip_prefix = "src",
+    deps = ["//tests/hackage:base"],
+)
+
+genrule(
+    name = "generate-main",
+    outs = ["src/Main.hs"],
+    cmd = "printf 'module Main where\nimport GenModule\nimport BinModule\n" +
+          "main = print (a+b) :: IO ()' > $@",
+)
+
+haskell_test(
+    name = "generated-modules",
+    size = "small",
+    srcs = [":generate-main"],
+    src_strip_prefix = "src",
+    deps = [
+        ":BinModule",
+        ":GenModule",
+        "//tests/hackage:base",
+    ],
+)