Luo Shuli wrote:

Dear Haskellers, I am a beginer of the haskell language and study it from <<Yet Another Haskell Tutarial>> of Hal Daume III. Example from the tutarial: Prelude> map Char.toUpper "Hello World"

This works only with ghci

I try it on Hugs for windows32, compile error: ERROR - Undefined qualified variable "Char.toUpper"

Could anybody tell me what's the matter with it?

In hugs load "Char" first with ":l Char" and then use toUpper unqualified: Char> map toUpper "Hello World" Christian