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

third_party/bazel/rules_haskell/tests/haddock/libC.nix

@@ -0,0 +1,47 @@
+# A trivial `haskellPackages` library that has haddock generation disabled
+self: pkgs:
+let
+  # pkgs = import ../../nixpkgs.nix {};
+
+  libC = pkgs.writeText "LibC.hs" ''
+    {-# language NoImplicitPrelude #-}
+    module LibC where
+
+    data LibCType = LibCType
+
+    -- | myfunction
+    mytype :: LibCType
+    mytype = LibCType
+  '';
+
+  cabal = pkgs.writeText "libc.cabal" ''
+    name: libc
+    version: 0.1.0.0
+    build-type: Simple
+    cabal-version: >=1.10
+
+    library
+      default-language: Haskell2010
+      exposed-modules: LibC
+   '';
+
+   src = pkgs.runCommand "libc-src" {} ''
+     mkdir $out
+     cp ${libC} $out/LibC.hs
+     cp ${cabal} $out/libc.cabal
+   '';
+
+in
+  # This call means the `.haddock` file is not generated,
+  # even though the ghc package still references the location
+  # where it would ordinarily be.
+  pkgs.haskell.lib.dontHaddock
+
+    (self.callPackage
+      ({ mkDerivation }: mkDerivation {
+        pname = "libc";
+        version = "0.1.0.0";
+        src = src;
+        license = pkgs.lib.licenses.mit;
+        isExecutable = false;
+      }) {})