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

third_party/bazel/rules_haskell/tests/haddock/LibA.hs

@@ -0,0 +1,19 @@
+-- | "LibA" header
+{-# LANGUAGE CPP             #-}
+{-# LANGUAGE TemplateHaskell #-}
+
+#include "header.h"
+
+module LibA where
+
+import LibA.A (a)
+import Deep (deep_lib)
+
+-- | 'A' declaration.
+data A =
+  -- | 'A' constructor.
+  A
+
+-- | Doc for 'f' using 'a' and 'deep_lib'.
+f :: Int
+f = const $a deep_lib + MAGIC_NUMBER