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

third_party/bazel/rules_haskell/tests/failures/transitive-deps/BUILD.bazel

@@ -0,0 +1,66 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+)
+
+package(default_testonly = 1)
+
+haskell_library(
+    name = "lib-a",
+    srcs = ["LibA.hs"],
+    deps = ["//tests/hackage:base"],
+)
+
+haskell_library(
+    name = "lib-b",
+    srcs = ["LibB.hs"],
+    visibility = ["//visibility:private"],
+    deps = [
+        ":lib-a",
+        "//tests/hackage:base",
+    ],
+)
+
+# Targets that must FAIL. These are tagged as manual so that
+#
+# $ bazel build //...
+#
+# does not fail.
+
+haskell_library(
+    # Should fail because it doesn't specify "base" explicitly.
+    name = "lib-cFailure",
+    srcs = ["LibC.hs"],
+    tags = ["manual"],
+    deps = [":lib-b"],
+)
+
+haskell_library(
+    name = "lib-c",
+    srcs = ["LibC.hs"],
+    deps = [
+        ":lib-b",
+        "//tests/hackage:base",
+    ],
+)
+
+haskell_library(
+    # Should fail because it doesn't specify "lib-a" explicitly.
+    name = "lib-dFailure",
+    srcs = ["LibD.hs"],
+    tags = ["manual"],
+    deps = [
+        ":lib-b",
+        "//tests/hackage:base",
+    ],
+)
+
+haskell_library(
+    name = "lib-d",
+    srcs = ["LibD.hs"],
+    deps = [
+        ":lib-a",
+        ":lib-b",
+        "//tests/hackage:base",
+    ],
+)

third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibA.hs

@@ -0,0 +1,4 @@
+module LibA (thingA) where
+
+thingA :: Int
+thingA = 5

third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibB.hs

@@ -0,0 +1,6 @@
+module LibB (thingB) where
+
+import LibA (thingA)
+
+thingB :: Int
+thingB = thingA + 1

third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibC.hs

@@ -0,0 +1,6 @@
+module LibC (thingC) where
+
+import LibB (thingB)
+
+thingC :: Int
+thingC = thingB * 2

third_party/bazel/rules_haskell/tests/failures/transitive-deps/LibD.hs

@@ -0,0 +1,7 @@
+module LibD (thingD) where
+
+import LibA (thingA)
+import LibB (thingB)
+
+thingD :: Int
+thingD = thingA + thingB