Importing liftA2 for base < 4.18, actually dropping installation from CI

Author: BurningWitness

.circleci/config.yml

@@ -22,7 +22,7 @@ jobs:
 
       - run:
           name: Update Dependencies
-          command: cabal new-update && cabal new-install --lib
+          command: cabal new-update
       - run:
           name: Build
           command: cabal new-build --enable-tests --enable-documentation

src/Data/RTree/Double/Strict/Internal.hs

@@ -64,6 +64,7 @@ module Data.RTree.Double.Strict.Internal
   , bulkSTR
   ) where
 
+import           Control.Applicative
 import           Control.DeepSeq
 import           Control.Exception (assert)
 import           Data.Bits

src/Data/RTree/Float/Strict/Internal.hs

@@ -64,6 +64,7 @@ module Data.RTree.Float.Strict.Internal
   , bulkSTR
   ) where
 
+import           Control.Applicative
 import           Control.DeepSeq
 import           Control.Exception (assert)
 import           Data.Bits