Use where instead of let for setting up aeson config.

src/Stack/ConfigCmd.hs

@@ -133,14 +133,15 @@ encodeDumpProject rawConfig format p
     | ConfigDumpYaml <- format = dumpProject (\e d ->
         either (const e) encodeUtf8 (cfgRedress rawConfig d ""))
     | ConfigDumpJson <- format = dumpProject (\_ d ->
-        let cmp = cfgKeyCompare rawConfig d ""
-        in toStrictBytes $ encodePretty' (Aeson.defConfig{confCompare = cmp}) d)
+        toStrictBytes $ encodePretty' (cfgPretty d) d)
     where
         -- REVIEW: Is there a way to encode straight to keymap?
         -- encode project to bytestring then decode to keymap.
         dumpProject f = let e = Yaml.encode p in Yaml.decodeEither' e &
             either (const e) (\(d :: KeyMap Yaml.Value) -> f e d)
 
+        cfgPretty d = Aeson.defConfig{confCompare = cfgKeyCompare rawConfig d ""}
+
 cfgKeyCompare :: RawYaml -> KeyMap Yaml.Value -> Text -> (Text -> Text -> Ordering)
 cfgKeyCompare (yamlLines -> configLines) (fmap Key.toText . KeyMap.keys -> keys) cmdKey =
     compareInOrder configLines (coerce keys) (coerce cmdKey)