[Haskell-beginners] Compiling

Chris Saunders evas at mountaincable.net
Fri Jun 25 01:34:29 EDT 2010

First, thanks for the reply Daniel.  I just wanted to add that I needed to 
use the command line "ghc --make hello.hs.  I first tried "ghc --make hello 
hello.hs" and this didn't work.  The second is closer to the command line 
that I used when I had the case error in the source code.

Chris Saunders

From: "Daniel Fischer" <daniel.is.fischer at web.de>
Sent: Friday, June 25, 2010 1:04 AM
To: <beginners at haskell.org>
Subject: Re: [Haskell-beginners] Compiling

> 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
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