Erreur de la cabine `Champs inconnus: build-tool-depends` essayer de suivre le tutoriel serviteur

Question

J'essaie de suivre the servant tutorial et je cours dans l'erreur Cabal Unknown fields: build-tool-depends. Ceci est mon fichier tutorial.cabal (je suis arrivé ce de servant's github repo):

name:    tutorial 
version:    0.10 
synopsis:   The servant tutorial 
homepage:   http://haskell-servant.readthedocs.org/ 
license:    BSD3 
license-file:  LICENSE 
author:    Servant Contributors 
maintainer:   haskell-servant-maintainers@googlegroups.com 
build-type:   Simple 
cabal-version:  >=1.10 

library 
    exposed-modules:  Server 
    build-depends:  base == 4.* 
        , base-compat 
        , text 
        , aeson 
        , aeson-compat 
        , blaze-html 
        , directory 
        , blaze-markup 
        , containers 
        , servant == 0.11.* 
        , servant-server == 0.11.* 
        , servant-client == 0.11.* 
        , servant-docs == 0.11.* 
        , servant-js >= 0.9 && <0.10 
        , warp 
        , http-api-data 
        , http-media 
        , lucid 
        , time 
        , string-conversions 
        , bytestring 
        , attoparsec 
        , mtl 
        , random 
        , js-jquery 
        , wai 
        , http-types 
        , transformers 
        , markdown-unlit >= 0.4 
        , http-client 
    default-language: Haskell2010 
    ghc-options:   -Wall -pgmL markdown-unlit 
    build-tool-depends: markdown-unlit:markdown-unlit 

test-suite spec 
    type: exitcode-stdio-1.0 
    ghc-options: -Wall 
    default-language: Haskell2010 
    hs-source-dirs: test 
    main-is: Spec.hs 
    other-modules: JavascriptSpec 
    build-depends: base == 4.* 
       , tutorial 
       , hspec 
       , hspec-wai 
       , string-conversions 

Si cabal build être en mesure de construire ce? Ceci est la sortie je reçois:

➜ servant cabal build 
Package has never been configured. Configuring with default flags. If this 
fails, please run configure manually. 
Warning: tutorial.cabal: Unknown fields: build-tool-depends (line 46) 
Fields allowed in this section: 
... 

cabal --version donne:

cabal-install version 1.24.0.2 
compiled using version 1.24.2.0 of the Cabal library 

Je ne pense pas que mes ApiType.hs questions de fichiers pour cette erreur, mais ici il est juste au cas où:

{-# LANGUAGE DataKinds #-} 
{-# LANGUAGE DeriveGeneriC#-} 
{-# LANGUAGE FlexibleInstances #-} 
{-# LANGUAGE GeneralizedNewtypeDeriving #-} 
{-# LANGUAGE MultiParamTypeClasses #-} 
{-# LANGUAGE OverloadedStrings #-} 
{-# LANGUAGE ScopedTypeVariables #-} 
{-# LANGUAGE TypeOperators #-} 

module Server where 

import Prelude() 
import Prelude.Compat 

import Control.Monad.Except 
import Control.Monad.Reader 
import Data.Aeson.Compat 
import Data.Aeson.Types 
import Data.Attoparsec.ByteString 
import Data.ByteString (ByteString) 
import Data.List 
import Data.Maybe 
import Data.String.Conversions 
import Data.Time.Calendar 
import GHC.Generics 
import Lucid 
import Network.HTTP.Media ((//), (/:)) 
import Network.Wai 
import Network.Wai.Handler.Warp 
import Servant 
import System.Directory 
import Text.Blaze 
import Text.Blaze.Html.Renderer.Utf8 
import qualified Data.Aeson.Parser 
import qualified Text.Blaze.Html 

type UserAPI = 
     "users" :> Get '[JSON] [User] 
-- :<|> "user" :> Capture "id" Integer :> Get '[JSON] User 
-- :<|> "user" :> ReqBody '[JSON] User :> Post '[JSON] User 

data User = User { 
    id :: Int, 
    name :: String, 
    age :: Int, 
    email :: String, 
    registration_date :: UTCTime 
} 

instance ToJSON User 

users1 :: [User] 
users1 = 
    [ User 1 "Isaac Newton" 372 "isaac@newton.co.uk" (fromGregorian 1683 3 1) 
    , User 2 "Albert Einstein" 136 "ae@mc2.org" (fromGregorian 1905 12 1) 
    ] 

server1 :: Server UserAPI 
server1 = return users1 

userAPI :: Proxy UserAPI 
userAPI = Proxy 

app1 :: Application 
app1 = serve userAPI server1 

main :: IO() 
main = run 8081 app1 

Toute aide est la bienvenue!

Answer 1

build-tool-depends est un nouveau domaine de cabal 2.0. Voir What's new in Cabal/cabal-install 2.0

champ Nouveau build-tool-depends qui remplace build-tools et a une sémantique mieux définie (n 3708, # 1541). cabal-install va maintenant installer les outils de construction requis et les ajouter automatiquement à PATH.