feat(third_party/bazel): Check in rules_haskell from Tweag r/17

2 files changed, 29 insertions, 0 deletions

diff --git a/third_party/bazel/rules_haskell/tutorial/lib/BUILD.bazel b/third_party/bazel/rules_haskell/tutorial/lib/BUILD.bazel
new file mode 100644
index 000000000000..1afb9822419c
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tutorial/lib/BUILD.bazel
@@ -0,0 +1,10 @@
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+)
+
+haskell_library(
+    name = "booleans",
+    srcs = ["Bool.hs"],
+    visibility = ["//main:__pkg__"],
+)
diff --git a/third_party/bazel/rules_haskell/tutorial/lib/Bool.hs b/third_party/bazel/rules_haskell/tutorial/lib/Bool.hs
new file mode 100644
index 000000000000..7390fcc0b838
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tutorial/lib/Bool.hs
@@ -0,0 +1,19 @@
+-- base is not available when no dependencies, so we have to define everything
+-- from scratch.
+{-# LANGUAGE NoImplicitPrelude #-}
+
+module Bool where
+
+data Bool = False | True
+
+not :: Bool -> Bool
+not False = True
+not True = False
+
+and :: Bool -> Bool -> Bool
+and True True = True
+and _ _ = False
+
+or :: Bool -> Bool -> Bool
+or False False = False
+or _ _ = True