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Today's Topics:
1. Re: :trace seems not to work in ghci (Sam Coles)
2. Getting Documentation with Command Line Hoogle Results
(Changlin Li)
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Message: 1
Date: Thu, 26 Sep 2013 15:19:41 -0500
From: Sam Coles <sammuel.co...@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] :trace seems not to work in ghci
Message-ID:
<CANoDC_Q1rBKH=t0r06nzkkcumca_eptaivpevjowut49wtf...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I think the modules need to be interpreted try using.
Prelude> :l *Main
On Thu, Sep 26, 2013 at 5:35 AM, Nathan H?sken <nathan.hues...@posteo.de>wrote:
> Hey,
>
> I have a program I want to debug in ghci because it crashes with an
> exception. So I do:
>
> Prelude> :l Main
> Ok, modules loaded: Main, PlotDisplay, PlotDiagram, ForexData.
> Prelude Main> :set -fbreak-on-exception
> Prelude Main> :trace main
> (...)
> Stopped at <exception thrown>
> _exception :: e = _
> [<exception thrown>] Prelude Main> :hist
> Empty history. Perhaps you forgot to use :trace?
> [<exception thrown>] Prelude Main> :back
> no more logged breakpoints
> [<exception thrown>] Prelude Main> :force _exception
> _exception = GHC.Exception.SomeException
> (GHC.Exception.ErrorCall "Prelude.tail: empty list")
>
> What could be the reason why :hist/:back/:trace are not working?
>
> Thanks!
> Nathan
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Message: 2
Date: Fri, 27 Sep 2013 05:53:45 -0400
From: Changlin Li <changli...@college.harvard.edu>
To: beginners@haskell.org
Subject: [Haskell-beginners] Getting Documentation with Command Line
Hoogle Results
Message-ID: <524555a9.7060...@college.harvard.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello all,
I've installed the command line version of Hoogle and everything seems
great. However, I was hoping to get a short documentation blurb with
each type signature as is the case when I search on the actual Hoogle
website.
Is there any way to enable this on the command line (I've already set
the Cabal configuration option for documentation to True) and
specifically, how can I do so for functions in Prelude and other
built-in modules?
Thanks!
Changlin Li
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