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

third_party/bazel/rules_haskell/tests/multi_repl/a/BUILD.bazel

@@ -0,0 +1,17 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+)
+
+haskell_library(
+    name = "a",
+    srcs = [
+        "src/A/A.hs",
+    ],
+    src_strip_prefix = "src",
+    deps = [
+        "//tests/hackage:base",
+    ],
+)

third_party/bazel/rules_haskell/tests/multi_repl/a/src/A/A.hs

@@ -0,0 +1,4 @@
+module A.A ( a ) where
+
+a :: ()
+a = ()