Haskell: min distance between neighbor numbers on a list -

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I am trying to define a factbook which finds a minimum distance between neighboring numbers on a list

Something like this: 

  Minneobresadence [2,3,6,2,0,1,9,8] => 1

My code looks like this: 

  minNeighborsDistance [] = [] minNeighborsDistance (x: xs) = minimum [minNeighborsDistance xs ++ [subtract Although it starts running, once I enter a list, I get an exception error.  
 I am new to Haskell. Any help in this case   
 
 
    
 Ol> 
  •  This will not match  []  in the first line. , Then 
    •  
  •  This will successfully match  (x: xs)  to specify a value for  x  and  xs  
    •    
     Forward, since you call  the empty    
  •  MinNeighborsDistance  recursively, you are Mesa will call it on a single list, except that when you pass it empty list. 
     
    •

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