Haskell 哈斯克尔&x2B;持久性:分析错误可能是不正确的缩进或不匹配的括号
在过去的几个月里,我一直在学习Haskell,并尝试按照本教程学习Haskell+Persistent: 我以前没有遇到过这种语法(他们在教程中谈到'quasiqueotes',所以我猜这就是它),但我认为,由于我直接从教程中获取了代码,它应该编译。但是,它不会,我得到以下错误:Haskell 哈斯克尔&x2B;持久性:分析错误可能是不正确的缩进或不匹配的括号,haskell,cabal,yesod,haskell-persistent,Haskell,Cabal,Yesod,Haskell Persistent,在过去的几个月里,我一直在学习Haskell,并尝试按照本教程学习Haskell+Persistent: 我以前没有遇到过这种语法(他们在教程中谈到'quasiqueotes',所以我猜这就是它),但我认为,由于我直接从教程中获取了代码,它应该编译。但是,它不会,我得到以下错误: /home/will/programming/learn-haskell/postgres-example/app/Main.hs:15:1: error: parse error (possibly inc
/home/will/programming/learn-haskell/postgres-example/app/Main.hs:15:1: error:
parse error (possibly incorrect indentation or mismatched brackets)
|
15 | Person
| ^
-- While building package postgres-example-0.1.0.0 using:
/home/will/.stack/setup-exe-cache/x86_64-linux-tinfo6/Cabal-simple_mPHDZzAJ_3.0.1.0_ghc-8.8.4 --builddir=.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.0.1.0 build exe:simple --ghc-options " -fdiagnostics-color=always"
Process exited with code: ExitFailure 1
这是我的阴谋集团文件中的配置:
name: postgres-example
version: 0.1.0.0
synopsis: An example of using Haskell and PostGres with persistent
description: Please see README.md
license: BSD3
license-file: LICENSE
author: Will Taylor
copyright: 2020, Will Taylor
category: Web
build-type: Simple
cabal-version: >=1.10
executable simple
hs-source-dirs: app
main-is: Main.hs
ghc-options: -threaded -rtsopts -with-rtsopts=-N
build-depends: base
, persistent
, persistent-template
, persistent-postgresql
, monad-logger
default-language: Haskell2010
如果有人能帮我的话,那就太棒了。我也是Haskell的初学者。遵循相同的文档,我试图将模式定义移动到另一个模块,并将其导入main。它只是无法处理相同的错误消息 在这里和那里尝试复制/粘贴代码并用postgres测试了2-3个小时之后,我在这个过程中意识到了一些东西。在文档中,包含语言特性的注释出现在文件的顶部 只需将注释移到顶部,然后再进行其他操作
{-# LANGUAGE EmptyDataDecls #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE UndecidableInstances #-}
module Sql.Schema where
import Database.Persist
import Database.Persist.TH
share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Person
firstName String
lastName String
age Int Maybe
PersonName firstName lastName
deriving Show
BlogPost
title String
authorId PersonId
deriving Show
|]
你能公布全部错误吗?我经常看到
可能不正确的缩进或不匹配的括号
,通常是缺少的)
。我已经编辑了这篇文章以包含全部错误。你这个可爱的美人!我实际上已经放弃了,因为我找不到任何有帮助的东西!这是一个愚蠢问题的简单解决方案-谢谢!
{-# LANGUAGE EmptyDataDecls #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE UndecidableInstances #-}
module Sql.Schema where
import Database.Persist
import Database.Persist.TH
share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Person
firstName String
lastName String
age Int Maybe
PersonName firstName lastName
deriving Show
BlogPost
title String
authorId PersonId
deriving Show
|]