diff --git a/adapter/kafka/Setup.hs b/adapter/kafka/Setup.hs
index 9a994af..4467109 100644
--- a/adapter/kafka/Setup.hs
+++ b/adapter/kafka/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/adapter/persistent/Setup.hs b/adapter/persistent/Setup.hs
index 9a994af..4467109 100644
--- a/adapter/persistent/Setup.hs
+++ b/adapter/persistent/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/adapter/protobuf/src/Mu/Adapter/ProtoBuf.hs b/adapter/protobuf/src/Mu/Adapter/ProtoBuf.hs
index 5d24393..187f4c7 100644
--- a/adapter/protobuf/src/Mu/Adapter/ProtoBuf.hs
+++ b/adapter/protobuf/src/Mu/Adapter/ProtoBuf.hs
@@ -44,7 +44,7 @@ import           Data.Int
 import           Data.SOP                 (All)
 import qualified Data.Text                as T
 import qualified Data.Text.Lazy           as LT
-import           Data.Word                (Word64, Word32)
+import           Data.Word                (Word32, Word64)
 import           GHC.TypeLits
 import           Proto3.Wire
 import qualified Proto3.Wire.Decode       as PBDec
diff --git a/core/rpc/Setup.hs b/core/rpc/Setup.hs
index 9a994af..4467109 100644
--- a/core/rpc/Setup.hs
+++ b/core/rpc/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/core/schema/Setup.hs b/core/schema/Setup.hs
index 9a994af..4467109 100644
--- a/core/schema/Setup.hs
+++ b/core/schema/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/default.nix b/default.nix
index b8d3caf..b468f8d 100644
--- a/default.nix
+++ b/default.nix
@@ -6,10 +6,17 @@ in
 { pkgs ? import nixpkgsSrc nixpkgsArgs
 }:
 let
+  gitignoreSrc = pkgs.fetchFromGitHub {
+    owner = "hercules-ci";
+    repo = "gitignore";
+    rev = "c4662e6";
+    sha256 = "sha256:1npnx0h6bd0d7ql93ka7azhj40zgjp815fw2r6smg8ch9p7mzdlx";
+  };
+  inherit (import gitignoreSrc { inherit (pkgs) lib; }) gitignoreSource;
   hnPkgs = pkgs.haskell-nix.stackProject {
     src = pkgs.haskell-nix.haskellLib.cleanGit {
       name = "mu-haskell";
-      src = ./.;
+      src = gitignoreSource ./.;
     };
   };
 in {
diff --git a/examples/health-check/src/ClientRecord.hs b/examples/health-check/src/ClientRecord.hs
index 41d1227..1ded6d4 100644
--- a/examples/health-check/src/ClientRecord.hs
+++ b/examples/health-check/src/ClientRecord.hs
@@ -5,7 +5,6 @@
 {-# language OverloadedStrings   #-}
 {-# language ScopedTypeVariables #-}
 {-# language TypeApplications    #-}
-{-# language TypeOperators       #-}
 module Main where
 
 import           Data.Conduit
diff --git a/examples/health-check/src/ClientTyApps.hs b/examples/health-check/src/ClientTyApps.hs
index 084ee98..c0b9abd 100644
--- a/examples/health-check/src/ClientTyApps.hs
+++ b/examples/health-check/src/ClientTyApps.hs
@@ -4,7 +4,6 @@
 {-# language OverloadedStrings   #-}
 {-# language ScopedTypeVariables #-}
 {-# language TypeApplications    #-}
-{-# language TypeOperators       #-}
 module Main where
 
 import           Data.Conduit
diff --git a/examples/seed/Setup.hs b/examples/seed/Setup.hs
index 9a994af..4467109 100644
--- a/examples/seed/Setup.hs
+++ b/examples/seed/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/examples/with-persistent/Setup.hs b/examples/with-persistent/Setup.hs
index 9a994af..4467109 100644
--- a/examples/with-persistent/Setup.hs
+++ b/examples/with-persistent/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/graphql/Setup.hs b/graphql/Setup.hs
index 9a994af..4467109 100644
--- a/graphql/Setup.hs
+++ b/graphql/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/graphql/src/Mu/GraphQL/Query/Parse.hs b/graphql/src/Mu/GraphQL/Query/Parse.hs
index ac036ac..15f9a28 100644
--- a/graphql/src/Mu/GraphQL/Query/Parse.hs
+++ b/graphql/src/Mu/GraphQL/Query/Parse.hs
@@ -22,8 +22,8 @@ import           Data.Int                    (Int32)
 import           Data.List                   (find)
 import           Data.Maybe
 import           Data.Proxy
-import           Data.SOP.NS
 import           Data.Scientific             (Scientific, floatingOrInteger, fromFloatDigits)
+import           Data.SOP.NS
 import qualified Data.Text                   as T
 import           GHC.TypeLits
 import qualified Language.GraphQL.AST        as GQL
diff --git a/grpc/client/Setup.hs b/grpc/client/Setup.hs
index 9a994af..4467109 100644
--- a/grpc/client/Setup.hs
+++ b/grpc/client/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/grpc/common/Setup.hs b/grpc/common/Setup.hs
index 9a994af..4467109 100644
--- a/grpc/common/Setup.hs
+++ b/grpc/common/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/grpc/server/Setup.hs b/grpc/server/Setup.hs
index 9a994af..4467109 100644
--- a/grpc/server/Setup.hs
+++ b/grpc/server/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain
diff --git a/python-test.nix b/python-test.nix
index 2c8dcdf..37c2bda 100644
--- a/python-test.nix
+++ b/python-test.nix
@@ -10,8 +10,7 @@ let
   ];
   python2 = pkgs.python27Packages.python.withPackages python2-packages;
   stack = pkgs.stack;
-in
-{
+in {
   test-schema = writeShellScriptBin "test-schema.sh" ''
   #!/bin/sh
   echo "BUILDING"
diff --git a/servant/server/Setup.hs b/servant/server/Setup.hs
index 9a994af..4467109 100644
--- a/servant/server/Setup.hs
+++ b/servant/server/Setup.hs
@@ -1,2 +1,2 @@
-import Distribution.Simple
+import           Distribution.Simple
 main = defaultMain