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

third_party/bazel/rules_haskell/tests/package-id-clash/BUILD.bazel

@@ -0,0 +1,24 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+)
+
+package(default_testonly = 1)
+
+haskell_library(
+    name = "sublib",
+    srcs = ["Foo.hs"],
+    visibility = ["//visibility:public"],
+    deps = ["//tests/hackage:base"],
+)
+
+haskell_library(
+    name = "lib",
+    srcs = ["Baz.hs"],
+    visibility = ["//visibility:public"],
+    deps = [
+        ":sublib",
+        "//tests/hackage:base",
+        "//tests/package-id-clash/sublib",
+    ],
+)

third_party/bazel/rules_haskell/tests/package-id-clash/Baz.hs

@@ -0,0 +1,7 @@
+module Baz (baz) where
+
+import Foo (foo)
+import Bar (bar)
+
+baz :: Int
+baz = foo + bar

third_party/bazel/rules_haskell/tests/package-id-clash/Foo.hs

@@ -0,0 +1,4 @@
+module Foo (foo) where
+
+foo :: Int
+foo = 5

third_party/bazel/rules_haskell/tests/package-id-clash/sublib/BUILD.bazel

@@ -0,0 +1,13 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+)
+
+package(default_testonly = 1)
+
+haskell_library(
+    name = "sublib",
+    srcs = ["Bar.hs"],
+    visibility = ["//visibility:public"],
+    deps = ["//tests/hackage:base"],
+)

third_party/bazel/rules_haskell/tests/package-id-clash/sublib/Bar.hs

@@ -0,0 +1,4 @@
+module Bar (bar) where
+
+bar :: Int
+bar = 6