daniel.is.fischer at web.de
Fri Jun 25 01:04:54 EDT 2010
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?
> Chris Saunders
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