example: Move extensions to cabal file

reflex-vty.cabal

@@ -82,7 +82,6 @@ library
     TypeApplications
     TypeFamilies
 
-
 executable example
   hs-source-dirs: src-bin
   main-is: example.hs
@@ -97,6 +96,37 @@ executable example
     transformers,
     vty
   default-language: Haskell2010
+  other-modules: Example.CPU
+  default-extensions:
+    BangPatterns
+    ConstraintKinds
+    CPP
+    DataKinds
+    DefaultSignatures
+    DeriveFunctor
+    DeriveGeneric
+    FlexibleContexts
+    FlexibleInstances
+    FunctionalDependencies
+    GADTs
+    GeneralizedNewtypeDeriving
+    KindSignatures
+    LambdaCase
+    MultiParamTypeClasses
+    MultiWayIf
+    OverloadedStrings
+    PatternGuards
+    PolyKinds
+    QuasiQuotes
+    RankNTypes
+    RecursiveDo
+    ScopedTypeVariables
+    StandaloneDeriving
+    TemplateHaskell
+    TupleSections
+    TypeApplications
+    TypeFamilies
+
 
 source-repository head
   type: git

src-bin/example.hs

@@ -1,14 +1,3 @@
-{-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE GADTs #-}
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE MultiParamTypeClasses #-}
-{-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE RecursiveDo #-}
-{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE ConstraintKinds #-}
-
 import Control.Applicative
 import Control.Monad
 import Control.Monad.Fix