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

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

@@ -0,0 +1,12 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+    "haskell_toolchain_library",
+)
+
+haskell_library(
+    name = "foo",
+    srcs = ["Foo.hs"],
+    visibility = ["//visibility:public"],
+    deps = ["//tests/hackage:base"],
+)

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

@@ -0,0 +1,3 @@
+module Foo where
+
+x = 2