lib, ui: GHC 8 compatibility

hledger-lib/future-package.yaml

@@ -81,7 +81,7 @@ dependencies:
   - regex-tdfa
   - safe >= 0.2
   - split >= 0.1 && < 0.3
-  - transformers >= 0.2 && < 0.5
+  - transformers >= 0.2 && < 0.6
   - uglymemo
   - utf8-string >= 0.3.5 && < 1.1
   - HUnit

hledger-lib/hledger-lib.cabal

@@ -84,7 +84,7 @@ library
     , regex-tdfa
     , safe >= 0.2
     , split >= 0.1 && < 0.3
-    , transformers >= 0.2 && < 0.5
+    , transformers >= 0.2 && < 0.6
     , uglymemo
     , utf8-string >= 0.3.5 && < 1.1
     , HUnit
@@ -164,7 +164,7 @@ test-suite tests
     , regex-tdfa
     , safe >= 0.2
     , split >= 0.1 && < 0.3
-    , transformers >= 0.2 && < 0.5
+    , transformers >= 0.2 && < 0.6
     , uglymemo
     , utf8-string >= 0.3.5 && < 1.1
     , HUnit

hledger-ui/Hledger/UI/UITypes.hs

@@ -4,6 +4,8 @@ import Data.Time.Calendar (Day)
 import qualified Graphics.Vty as V
 import Brick
 import Brick.Widgets.List (List)
+import Text.Show.Functions ()
+  -- import the Show instance for functions. Warning, this also re-exports it
 
 import Hledger
 import Hledger.UI.UIOptions