GHCi错误:不在范围内

Question

我正在尝试从Learn You a Haskell for Great Good中编译这个函数.

 removeNonUppercase st = [ c | c <- st, c `elem` ['A'..'Z']]   

将它放入removeNonUpperCase.hs文件中.

编译很好,但在传递参数时:

ghci> removeNonUppercase "Hahaha! Ahahaha!"  

编译器说:

<interactive>:1:0: Not in scope: 'removeNonUpperCase'

为什么？

PrintScreen:http://img535.imageshack.us/img535/9545/notinscope.png

Answer 1

您将方法定义为removeNonUppercase(小写c),但您将其称为removeNonUpperCase(大写C).