make compile with 9.0.2

ptghci.cabal

@@ -1,10 +1,10 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.34.4.
+-- This file has been generated from package.yaml by hpack version 0.35.0.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: af5d4c08d5bdf87ae8de1c143eb468cfd7280e01f5163ee7953c86d6bc265b0b
+-- hash: c35a86189a98da5437e4adaf3cffc7055a184128f0256e9e33334184758dd618
 
 name:           ptghci
 version:        0.1.0.0
@@ -135,13 +135,13 @@ library
     , unordered-containers
     , yaml
     , zeromq4-haskell
+  default-language: Haskell2010
   if flag(use-python-embed)
     pkgconfig-depends:
         python3-embed
   else
     pkgconfig-depends:
         python
-  default-language: Haskell2010
 
 executable ptghci
   main-is: Main.hs

src/Language/Haskell/PtGhci/Prelude.hs

@@ -1,32 +1,35 @@
+module Language.Haskell.PtGhci.Prelude
+  ( module P,
+    module MicroLens,
+    module Language.Haskell.PtGhci.Prelude,
+    String,
+    StringConv,
+    toS,
+    -- , unwords
+  )
+where
 
-module Language.Haskell.PtGhci.Prelude 
-  ( module P
-  , module MicroLens
-  , module Language.Haskell.PtGhci.Prelude 
-  , String
-  -- , unwords
-) where 
-
-import Protolude as P hiding ((%), to, trace)
 -- import Prelude (unwords)
+import Control.Exception (throw)
+import qualified Data.Text as T
+import GHC.Base (String)
 import Lens.Micro as MicroLens
+import Protolude as P hiding (to, toS, trace, (%))
 import qualified Protolude as P
-import qualified Data.Text as T
+import Protolude.Conv (StringConv, toS)
 import Text.Printf
-import Control.Exception (throw)
-import GHC.Base (String)
 
 tail :: [a] -> Maybe [a]
 tail [] = Nothing
-tail (a:as) = Just as
+tail (a : as) = Just as
 
 (!?) :: [a] -> Int -> Maybe a
 (!?) [] _ = Nothing
-(!?) (x:ls) 0 = Just x
-(!?) (x:ls) i = ls !? (i-1)
+(!?) (x : ls) 0 = Just x
+(!?) (x : ls) i = ls !? (i - 1)
 
 -- tryP :: (Exception e) => Ptg a -> Ptg (Either e a)
 -- tryP (Ptg action) = do
 --   r <- ask
 --   runReaderT r action
---   return $ Ptg $ 
+--   return $ Ptg $

stack.yaml

@@ -17,7 +17,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-16.0
+resolver: lts-19.29
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.

stack.yaml.lock

@@ -0,0 +1,12 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    sha256: 0ced7f93245307212900d760c1322dfb527c4b902868c11ccac37f48b7d4ebb9
+    size: 619200
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/29.yaml
+  original: lts-19.29