Re: [Haskell-beginners] Beginners Digest, Vol 68, Issue 23

25 Feb 2014

      Good morning,

Re: Today's Topic 1 - see below.

My apology for not including the error message.

The following is what I did:
     I downloaded the source code and did the following [from the O'Reilly 
book]:
           1. download was done on a Mac.
           2. I saved the file to helloWorld.hs
           3. I went to my terminal screen and executed:
               runhaskell helloworld.hs
           4. on the terminal the following appeared:
               hell yeah
           5. so far, so good
           6. I went to my browser and entered the url:
               http://localhost:3000
           7. I was expecting to see the following on my browser:
               <!DOCTYPE html>
               <html><head><title></head><body>hell yeah</body></html>
            8. Unfortunately, I get the following message:
                "Safari can't connect to Server
                 Safari can't open page "http://localhost:3000" because
                 Safari can't connect to server "localhost"

Good day,
Patrick

----- Original Message ----- 
From: 
To: 
Sent: Tuesday, February 25, 2014 7:00 AM
Subject: Beginners Digest, Vol 68, Issue 23
...
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Today's Topics:
1. Re:  Beginners Digest, Vol 68, Issue 22 (KMandPJLynch)
  2. Re:  Beginners Digest, Vol 68, Issue 22 (Mateusz Kowalczyk)
----------------------------------------------------------------------
Message: 1
Date: Mon, 24 Feb 2014 20:32:40 -0500
From: KMandPJLynch 
To: beginners@haskell.org
Subject: Re: [Haskell-beginners] Beginners Digest, Vol 68, Issue 22
Message-ID: <609E40BD-3267-4F21-88A6-1BDC4DEDC609@verizon.net>
Content-Type: text/plain; charset=us-ascii
Good evening,
I'm trying to learn how to implement Haskell on a web site.
I've got the O'Reilly book: "Developing Web Applications with Haskell and 
Yesod".
I'd appreciate some guidance in regard to this.
I'm having a bit of a problem getting the helloWorld.hs app up and running 
on Yesod.
Thank you
On Feb 24, 2014, at 2:30 PM, beginners-request@haskell.org wrote:
...
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of Beginners digest..."
Today's Topics:
1.  Failure to install cabal-install. (Derek Mahar)
  2. Re:  Failure to install cabal-install. (Derek Mahar)
----------------------------------------------------------------------
Message: 1
Date: Mon, 24 Feb 2014 13:20:45 -0500
From: Derek Mahar 
To: beginners@haskell.org
Subject: [Haskell-beginners] Failure to install cabal-install.
Message-ID:

Content-Type: text/plain; charset="utf-8"
How can I tell the Haskell compiler where to find module
Control.Monad.Error?  After building GHC 7.6.3 and Haskell Platform 
2013.2
on Red Hat Linux 6, I found that 'cabal install cabal-install' fails when
it attempts to build library HTTP-4000.2.11 because the Haskell compiler
cannot find module Control.Monad.Error.
*******************************************************
* Installation completed successfully.
*
* Programs installed into:
*   /usr/local/bin
*
* Now do "cabal update" to initialize the package list
*
* Additional packages may be found at http://hackage.haskell.org
* or via "cabal list <pattern>"
*
* Use "cabal install <foo>" to install additional packages
*
*******************************************************
[dmahar@dmahar haskell-platform-2013.2.0.0]$ cabal update
Downloading the latest package list from hackage.haskell.org
Note: there is a new version of cabal-install available.
To upgrade, run: cabal install cabal-install
[dmahar@dmahar haskell-platform-2013.2.0.0]$ cabal install cabal-install
Resolving dependencies...
Configuring HTTP-4000.2.11...
Building HTTP-4000.2.11...
Preprocessing library HTTP-4000.2.11...
Network/Stream.hs:35:8:
   Could not find module `Control.Monad.Error'
   There are files missing in the `mtl-2.1.2' package,
   try running 'ghc-pkg check'.
   Use -v to see a list of the files searched for.
Failed to install HTTP-4000.2.11
cabal: Error: some packages failed to install:
HTTP-4000.2.11 failed during the building phase. The exception was:
ExitFailure 1
cabal-install-1.18.0.2 depends on HTTP-4000.2.11 which failed to install.
Thank you,
Derek

Re: [Haskell-beginners] Beginners Digest, Vol 68, Issue 23

Patrick Lynch