为什么抱怨Haskell解析错误输入`|'在这个函数中？ [英] Why complains Haskell parse error on input `|' in this Function?

问题描述

我本来应该在Haskell中写一个小函数，它应该擦除列表中两次的元素。不幸的是，Haskell抱怨输入`|'解析错误。任何人都可以帮助我吗？

  makeSets = mSet [] s 
其中
 m设置堆栈[] = stack 
 m设置堆栈（x：xs）
 |包含堆栈x = mSetstack xs 
 |否则= mSet（x：stack）xs 
其中
包含[] thing = False 
包含（x：xs）thing 
 | x == thing = true 
 | otherwise = contains xs thing 
  

解决方案 div>

你在混合标签和空格，当缩进非常重要时，这是不好的。使用全部空格（强烈推荐）或全部选项卡。

I was supposed to write a little function in Haskell, which should erase elements, which are twice in the list. Unfortunately, Haskell complains " parse error on input `|' ". Could anyone help me with that?

makeSets=mSet[]s
         where 
            mSet stack []=stack
            mSet stack (x:xs)
                             |contains stack x=mSetstack xs
                             | otherwise =mSet (x:stack) xs
                                          where 
                                                contains [] thing=False
                                                contains (x:xs)thing
                                                                     | x==thing=True
                                                                     |otherwise=contains xs thing

解决方案

You are mixing tabs and spaces, which is no good when indentation is significant. Use either all spaces (strongly recommended), or all tabs.

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