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

third_party/bazel/rules_haskell/tests/c-compiles-still/BUILD.bazel

@@ -0,0 +1,15 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+)
+
+package(default_testonly = 1)
+
+haskell_library(
+    name = "foo",
+    srcs = ["Foo.hs"],
+    deps = [
+        "//tests/data:ourclibrary",
+        "//tests/hackage:base",
+    ],
+)

third_party/bazel/rules_haskell/tests/c-compiles-still/Foo.hs

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