On Friday 25 June 2010 06:50:06, Chris Saunders wrote:
I have just started trying to learn Haskell again (I seem to have a mental block against this language). Right now I'm using Haskell in 5 steps. I have created the file hello.hs exactly as in the section "Write your first Haskell program". I then opened a cmd (I'm using Windows) window in the directory where I created hello.hs and entered "ghc -o hello hello.hs".
The matter with upper/lower case has already been treated, so I'll focus on the command line. Unless you know exactly that you can't use the --make option and why, always compile with ghc --make [other options if wanted] file[s] without --make, you'll get some puzzling 'undefined symbol' messages from the linker sooner rather than later.
What follows is the output of the cmd window:
hello.hs:1:7: Not in scope: data constructor `PutStrLn'
Can someone tell me why I am having this problem?
Regards Chris Saunders