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只是想知道如何在haskell中获得字符的ascii值？我试图在ghci中使用'ord'函数,基于我在这里阅读的内容:

http://haskell.org/ghc/docs/6.12.2/html/libraries/base-4.2.0.1/Data-Char.html#6

GHCi, version 6.12.1: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Prelude> ord 'a'

<interactive>:1:0: Not in scope: `ord'
Prelude>

我究竟做错了什么？