On 28 sep 2010, at 17:33, Ozgur Akgun wrote:
How do you define relationships between data types?
Well, why is it any different from other fields? From one of your examples
[1], I'd expect you to have a list of questions in the Quiz data type, and if
necessary, a quiz field in the Question
Hey Jonathan,
I've done some work on this. The hard part is defining relationships between
datatypes: how do you model this in Haskell? I've some code on github:
http://github.com/chriseidhof/persist, you might be interested in that.
-chris
On 25 sep 2010, at 21:31, Jonathan Geddes wrote:
For completeness, using fclabels (yet another record package) you can write it
like this:
{-# LANGUAGE TemplateHaskell #-}
module Records where
import Data.Record.Label
data MyRecord = MyRecord { _field1 :: String, _field2 :: Int, _field3 :: Bool
}
$(mkLabels [''MyRecord])
On 5 sep 2010, at 09:28, Ben Lippmeier wrote:
On 05/09/2010, at 2:38 AM, Michael Litchard wrote:
I'll be starting a new job soon as systems tool guy. The shop is a
perl shop as far as internal automation tasks go. But I am fortunate
to not be working with bigots. If they see a better way,
On 31 aug 2010, at 08:24, strejon wrote:
Hello. I'm using Haskell to write a specification for some software. The
software uses certificates (standard X.509 certificates) and stores user
name information in the Subject's CommonName field.
The X.509 standard doesn't actually require the
This looks very cool! It would be nice to put the pdf online somewhere, and add
a link from the package documentation. Also, the chat client seems to have some
problems with output buffering on my system (OS X, GHC 6.12).
-chris
On 3 aug 2010, at 10:35, Frank Kupke wrote:
Hi,
DSTM is an
I think the general process is the same. You define your components, try to
decouple them as much as possible and implement them. One thing that is
different from other languages: try to write as much pure code as possible.
This is great for creating composable components.
There are several
On 5 jul 2010, at 23:48, Yves Parès wrote:
Hello,
I don't know if some of you are familiar with the SFML library (stands for
Simple and Fast Multimedia Library) -- http://sfml-dev.org
As SDL, SFML is a 2D graphics library, but conversely to SDL it provides a
hardware-accelerated drawing,
].
But wouldn't it damage the performances, since code will have to go through
an extra layer?
[1] http://blog.ezyang.com/2010/06/principles-of-ffi-api-design
2010/7/7 Chris Eidhof ch...@eidhof.nl
On 5 jul 2010, at 23:48, Yves Parès wrote:
Hello,
I don't know if some of you are familiar
On 14 jun 2010, at 07:42, Aran Donohue wrote:
Hi Cafe,
I've been doing Haskell for a few months, and I've written some mid-sized
programs and many small ones. I've read lots of documentation and many
papers, but I'm having difficulty making the jump into some of the advanced
concepts
Nhe most important reference in literature might be Okasaki's Purely functional
data structures:
@book{okasaki1999purely,
title={{Purely functional data structures}},
author={Okasaki, C.},
year={1999},
publisher={Cambridge Univ Pr}
}
-chris
On 28 mei 2010, at 05:23, Casey Hawthorne
Awesome! Congratulations on the first release, I look forward to working with
it. Also, the web design is great, possibly the best designed Haskell library
website I've seen so far.
-chris
On 22 mei 2010, at 07:25, Gregory Collins wrote:
Hello all,
To coincide with Hac Phi 2010
I have a different problem (also after doing a cabal update): I get a bus
error. I just created this ticket for it:
http://hackage.haskell.org/trac/hackage/ticket/691
-chris
On 22 mei 2010, at 13:20, Bill Atkins wrote:
When I run cabal update on my Mac (Snow Leopard, Intel), I get:
%
Maybe this is what you are looking for:
http://www.haskell.org/haskellwiki/Idiom_brackets
-chris
On 9 mei 2010, at 18:39, Xiao-Yong Jin wrote:
Hi,
Is it possible to have a function accept variable number of
arguments, such that 'f' can be instantiated to different
concrete types as
f
There is the ChristmasTree package
(http://hackage.haskell.org/package/ChristmasTree) which provides a very fast
read alternative by deriving grammars for each datatype. If you want to know
the speed differences, see http://www.cs.uu.nl/wiki/bin/view/Center/TTTAS for
more information (it's in
I've generated large LaTeX documents with several modules without too much
hassle. The key was to use %include a lot, as well as conditionals. Lots of %if
False around import statements.
-chris
On 5 mei 2010, at 20:18, Pierre-Etienne Meunier wrote:
By the way, if someone on this list has got
Hey everyone,
After I upgraded to a newer cabal-install my cabal-install broke again: I get a
Bus Error when doing cabal update or cabal install something. The version
that was bundled with the Haskell platform worked fine, but now it's broken
again. I'm not sure what it was that went wrong or
I agree. This would be an extremely useful feature, not only for game
development, but also for web development. We often use continuations as a way
to add state to the web, but this fails for two reasons: whenever the server
restarts, or when we scale to multiple machines.
However, I think it
We've used this library to generate a prototype JVM backend for UHC about a
year ago, and it Just Worked. That was probably on 6.10 or 6.8.
-chris
On 26 mrt 2010, at 21:33, Brian Alliet wrote:
On Fri, Mar 26, 2010 at 08:01:57PM +, Alexandru Scvortov wrote:
I'm thinking of writing a
On 26 mrt 2010, at 22:37, Alexandru Scvortov wrote:
How stable is it?
I don't know. I remember that we didn't have to change anything and that
everything just worked.
Was it easy to use?
Actually yes, because:
Did it have enough documentation?
I think we used the Java documentation. The
No. A solution for this (depending on the type class you want to derive) is
Generic Programming. Using Generic Programming, you can define functions that
work on the structure of the type.
For example, take a look at the regular package [1]. It provides all the
functionality to write your own
On 23 mrt 2010, at 14:27, Bas van Dijk wrote:
On Tue, Mar 23, 2010 at 2:13 PM, Sebastiaan Visser sfvis...@cs.uu.nl wrote:
Nice! This is certainly worth it.
BTW What's the git equivalent of 'darcs send -o filename' which
saves the patches to filename? I would rather send my patches as
email
From the ZuriHac hackathon, I am happy to announce the first release of the
regular-web package [1]. The package contains functions for generic web
programming: generating HTML, JSON and Formlets. It is based on the regular
generic programming library [2].
Generic HTML and forms are often not
What about this?
{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances,
UndecidableInstances, FlexibleContexts, EmptyDataDecls, ScopedTypeVariables,
TypeOperators, TypeSynonymInstances #-}
data Data k = Pair Integer (() - k)
data RecData = RecData (Data RecData)
We need to explicitly quantify over the type variables so that we can give an
explicit type signature on the following line:
let method = select s :: a - f a
There might be an easier way to do this, but I'm not sure how exactly.
-chris
On Tue, Mar 16, 2010 at 2:39 AM, Chris Eidhof ch
I'd like to add Urban Boquist's thesis to that list:
http://www.cs.chalmers.se/~boquist/phd/index.html
(I've added it to the wiki page as well).
-chris
On 1 mrt 2010, at 22:26, Don Stewart wrote:
mvanier42:
Hi everyone,
I'm interested in collecting good references for compiler
We run a couple of Happstack processes with FastCGI, and it works like a charm.
We even wrote a module for it:
http://hackage.haskell.org/package/happstack-fastcgi
-chris
On 1 mrt 2010, at 20:19, Yitzchak Gale wrote:
brad clawsie wrote:
should i just try out something based on fastcgi?
not build 64bit binaries. So
upgrading ghc won't solve it.
--nwn
On Mon, Feb 8, 2010 at 12:50 AM, Chris Eidhof ch...@eidhof.nl wrote:
Thanks. Unfortunately, it didn't help. The thing that frustrates me is that
it's quite hard to debug. I guess I'll upgrade my GHC to 6.12, hopefully
I don't think it's pure. I would definitely use a pure language on the JVM, but
IIRC Open Quark / Cal is an impure language. For example, from the library
documentation: printLine :: String - ().
-chris
On 9 feb 2010, at 15:31, Tim Wawrzynczak wrote:
Perhaps this is similar to what you're
On 7 feb 2010, at 19:52, Lars Viklund wrote:
On Sun, Feb 07, 2010 at 05:12:23PM +, Ben Millwood wrote:
This failed with just the text Bus error. I searched the HTTPBis git
repository, but couldn't find the text Bus error. I don't have a clue of
how to fix this.
Bus error is a message
I should add that I was able to work around the issue by using Michael
Snoyman's http-wget [1] package. It uses the command-line version of wget,
which does work on my machine.
-chris
[1]: http://hackage.haskell.org/package/http-wget
On 7 feb 2010, at 16:50, Chris Eidhof wrote:
Thanks
Thanks. Unfortunately, it didn't help. The thing that frustrates me is that
it's quite hard to debug. I guess I'll upgrade my GHC to 6.12, hopefully
that'll solve it.
-chris
On 7 feb 2010, at 16:07, Yusaku Hashimoto wrote:
Hello,
On Sat, Feb 6, 2010 at 2:51 AM, Chris Eidhof ch
Hi everyone,
I'm trying to do a number of successive HTTP requests in one program. Here's
what I tried:
Approach 1: I used the 'download' package, which failed to install on OS X. It
fails with error: libio.h: No such file or directory.
Approach 2: I installed the 'download-curl' package, and
Hi Matveev,
You might be interested in the System.Directory module:
http://hackage.haskell.org/packages/archive/directory/1.0.0.3/doc/html/System-Directory.html
HTH,
-chris
On 27 jan 2010, at 18:06, Matveev Vladimir wrote:
Hi,
I'm writing cross-platform application in Haskell which should
Formlets themselves don't require a server. You can use them from the
commandline. However, formlets do have a limitation: they are not interactive.
I would really like a library that does something like formlets (compositional
web forms) but with a FRP-style of writing. A contrived example:
I'm not sure if it is of any help, but at the haskell-wiki there's an article
about how to communicate between Haskell and Objective-C using XCode:
http://haskell.org/haskellwiki/Using_Haskell_in_an_Xcode_Cocoa_project
-chris
On 4 jan 2010, at 00:36, Ivan Miljenovic wrote:
If I recall
Also, there is a paper about doing a type-safe diff in Agda,
http://portal.acm.org/citation.cfm?id=1596614.1596624
I heard rumors that the library will be ported to Haskell.
-chris
On 8 dec 2009, at 15:20, Bayley, Alistair wrote:
From: haskell-cafe-boun...@haskell.org
On 2 nov 2009, at 03:30, Manuel M T Chakravarty wrote:
Chris Eidhof:
I'm trying to call a Haskell function from C, on OS X. There's an
excellent post [1] by Tomáš Janoušek that explains how to do this
on Linux. However, on OS X, it's different. First of all, it looks
like the -no-hs-main
I can confirm that, if you follow the steps on the wiki, you'll end up
with a working Mac application. Excellent work John, thanks very much!
-chris
On 30 okt 2009, at 00:53, John Velman wrote:
It's taken 21 days with interruptions, but I finally posted a
tutorial with
details of what I
Hey all,
I'm trying to call a Haskell function from C, on OS X. There's an
excellent post [1] by Tomáš Janoušek that explains how to do this on
Linux. However, on OS X, it's different. First of all, it looks like
the -no-hs-main flag is ignored, because I get the following error:
ghc
That sounds really interesting, it would be great if you could share
some of your work by putting it on hackage or posting a link to the
repository!
-chris
On 5 okt 2009, at 12:42, Andrew U. Frank wrote:
writing a gui is a mess (independent of wx or gtk) - too much detail
is shown
and
Hey Colin,
Currently, I don't think this is supported. It would help a lot if you
could send me a dumbed-down version of your code, I'll file an issue
for it on github.
Thanks,
-chris
On 23 sep 2009, at 14:35, Colin Adams wrote:
Just in case you missed it on the cafe.
--
Hey Colin,
The code looks OK to me. Are you sure you are setting the right method
for your form? It's the third component of the tuple returned by the
runFormState.
Thanks,
-chris
On 22 sep 2009, at 08:56, Colin Adams wrote:
I'm writing a form that involves picking a file to upload,
all of this yet.
2009/9/23 Chris Eidhof ch...@eidhof.nl:
Hey Colin,
The code looks OK to me. Are you sure you are setting the right
method for
your form? It's the third component of the tuple returned by the
runFormState.
Thanks,
-chris
On 22 sep 2009, at 08:56, Colin Adams wrote:
I'm
Hey everybody,
I've just uploaded formlets 0.6.1 to Hackage, which should fix this
bug. Thanks for letting me know!
-chris
On 29 aug 2009, at 13:22, Jeremy Shaw wrote:
Hello,
Yeah, it seems that checkM in formlets 0.6 broken. I reported the
bug to MightByte as well.
- jeremy
At Fri,
Hey everyone,
I wanted to let you know that the formlets team has released a new
version of the formlets [1] on hackage, a library to build type-safe,
composable web forms. Most notably, Mightybyte and I worked on the
massInput functionality, which is now ready for use! Mightybyte has an
Hey Kev,
The types are thrown away during compile time. Therefore, if you
have a constructor VWrapper :: a - Value nothing is known about
that a when you scrutinize it.
What you could do, however, is something like this:
data Value a where
VInt :: Integer - Value Integer
...
as there is a fair bit
of code to change, and it cascades down through the data structures
(maybe a forall a . Value a will help here?)
I will have a go at this approach. In case anyone is interested the
code is at http://github.com/KMahoney
2009/7/13 Chris Eidhof ch...@eidhof.nl:
Hey Kev
Hi everyone,
The Dutch HUG [1] will meet again tomorrow. This time we'll meet in
Utrecht again, at the Stairway To Heaven. The meeting will start at
19h. The venue is a sometimes a bit noisy, but there's beer and nice
big tables. If you want to hear everything about the Dutch HUG
On 4 jul 2009, at 05:13, Alexander Dunlap wrote:
On Fri, Jul 3, 2009 at 6:45 PM, John Kynewho...@gmail.com wrote:
Hi,
Currently I'm pretty printing code by building arrays of strings
and calling
indent. For example:
instance JavaPrintableNamed AST.EnumeratedType where
javaLinesNamed
On 3 jul 2009, at 11:28, Jochem Berndsen wrote:
Chris Eidhof wrote:
I've something working that sort of does this. You define your
model in
the following way:
data User = User {name :: String, password :: String, age :: Int,
post
:: BelongsTo Post}
data Post = Post {title :: String, body
Hey Marc,
On 30 jun 2009, at 19:52, Marc Weber wrote:
Is there anyone interested in helping building a library which
a) let's you define kind of model of you data
b) let's you store you model in any backend (maybe a relational
database)
c) does static checking of your queries at compilation
Hey all,
On 15 jun 2009, at 08:39, Ashley Yakeley wrote:
Thomas Davie wrote:
We had a lot of fun deciding Haskell's new logo, and while I
don't agree with the final result, it would be nice if we could now
start consistently using it. With that in mind, I realised that
the Haskell
Hi everyone,
Tonight there will be another meeting of the Dutch Haskell Users'
Group! This time we'll meet in Amsterdam, in the library. On the wiki
[1] you can find the details of how to reach it. We'll be at the top
floor and shouldn't be hard to recognize. The meeting is set to begin
If anyone else has problems installing gitit, try updating your cabal-
install (and cabal). I had old versions on my computer, and updating
them solved my gitit build-problems.
-chris
On 9 nov 2008, at 22:41, John MacFarlane wrote:
I've just uploaded a new version (0.2.1) that requires
I think it might be more appropriate to move this discussion to
haskell-cafe.
On 19 okt 2008, at 17:24, Friedrich wrote:
Learn to love types: one of the neat things about Haskell is that if
you can write down the type of a function then you have usually done
90% of the work of writing the
#a1
[2] http://haskell.org/haskellwiki/Formlets
Chris Eidhof schrieb:
That means that you don't have input0 in your environment, maybe
you're passing in an empty environment?
-chris
On 21 sep 2008, at 12:11, Martin Huschenbett wrote:
Hi Chris,
thanks for the updated example. Compiling works now
Hey Martin,
On 19 sep 2008, at 04:14, Martin Huschenbett wrote:
I found a blog post concerning formlets [1] in the web. Since looks
very interesting I tried to compile the sample code with recent
versions of HAppS and formlets from hackage. But this didn't work as
the API of formlets has
Hey all,
I was playing around with type families, and I have a strange problem.
Suppose we have an alternative to an Either datatype:
data (:|:) a b = Inl a | Inr b
and a class Ix:
class Ix i where
type IxMap i :: * - *
empty :: IxMap i [Int]
Now I want to give an instance for (a
I plan to give a course in compiler construction,
using Haskell as the implementation language
(not as source or target language).
Something along these lines:
1. combinator parsers (Parsec),
2. simple interpreter (arithmetical expressions)
3. add algebraic data types, functions
4. type checker
Hey everyone,
We started working on a client [1] for the sphinx full-text search
engine [2], which is a very fast full-text search engine that has
either SQL or XML as a backend. While our version is far from done (it
only supports the query command, and a limited number of parameters),
Hey all,
When compiling GHC 6.8.3 on OS X, I ended up with a GHCi without
readline support. That makes interacting quite hard, especially
because the Backspace-key didn't even work. With some help on irc from
Baughn and by reading a blog post from Paul Brown, I managed to get
readline
Hey everyone,
I'm figuring out how to do databases in Haskell (on OS X). So far,
I've tried the following approaches:
1. hdbc. I'd like to connect to MySQL, so I need the ODBC backend. I
couldn't get this to work under OS X, while I installed myodbc, which
seems to be broken.
2. hsql.
On 23 jun 2008, at 22:26, Spencer Janssen wrote:
On Sun, Jun 22, 2008 at 02:52:33AM -0300, Maurí cio wrote:
Hi,
Are there mature libraries for IMAP and NNTP
available to Haskell?
Thanks,
Maurício
There is the haskellnet project:
http://darcs.haskell.org/SoC/haskellnet/
I'm not sure
Hey Brad,
I wrote a blog-post with some curl-examples in there, it's a small
mashup of last.fm and upcoming, check it at
http://tinyurl.com/5d8jx7
Enjoy,
-chris
On 11 jun 2008, at 07:51, brad clawsie wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
in search of some trivial examples
Hey Andrew,
On 11 jun 2008, at 20:17, Andrew Coppin wrote:
According to the theory, anything that consumes a list and produces
a value is some kind of fold. [Assuming it traverses the list in a
sensible order!] So it looks like you could implement this as a
fold. But should that be a
Hey everyone,
I was tired of all those graphical Twitter clients that aren't usable
from my Terminal, so I wrote my own. It's still very much alpha, but
comments or improvements are more than welcome. You can install it by
downloading the twitter-package from hackage.
In order to get it
On 7 dec 2007, at 22:55, Ryan Bloor wrote:
hi
The thing is... it will be a simple parser really. The expressions
are already defined and we can't use parsec imports. Below is the
types I have.
I have a function that removes initial spaces from the start of a
string. A function that
On 7 dec 2007, at 23:51, Ryan Bloor wrote:
i am using hugs and the isDigit and anything 'is' doesn't work...
they must have forgot to add them in! Does GHC work with them.
Yes, it's in base. Alternatively, you could write the functions
yourself, they're not that hard.
p.s... that book looks
On 6 dec 2007, at 18:06, Ryan Bloor wrote:
Can anyone advise me on how to check whether a string contains ints,
chars, bools, etc
2345 + 6767 shoudl give IntAdd (2345) (6767)
2345 should give IntT 2345
You need to write a parser. There are a lot of libraries that will
help you write a
On 27 nov 2007, at 10:14, Reinier Lamers wrote:
Chris Eidhof wrote:
On 26 nov 2007, at 19:48, Henning Thielemann wrote:
I wonder whether it is a typical mistake of beginners
to write 'return' within a do-block (that is, not at the end)
and if it is possible to avoid this mistake by clever
On 26 nov 2007, at 19:48, Henning Thielemann wrote:
I wonder whether it is a typical mistake of beginners
to write 'return' within a do-block (that is, not at the end)
and if it is possible to avoid this mistake by clever typing.
In a proper monad 'return' can be fused with subsequent actions,
Hey Haskell-Cafe,
I was trying out the code in Dons's article [1], and I noticed a
weird thing when doing it in GHCi. When binding the function
composition to a variable, the type suddenly changes. I'm not
completely sure why this happens. Is this because GHCi is in a monad
and wants to
One thing I did was replacing the Reply button in my toolbar with
Reply All. The only problem is that I always use Cmd+R instead of
clicking a button, but I'm at least a little bit closer.
-chris
On 6-mei-2007, at 15:21, [EMAIL PROTECTED] wrote:
Andrew Coppin [EMAIL PROTECTED] writes:
On Mar 24, 2007, at 2:36 AM, Sebastian Sylvan wrote:
On 3/24/07, Chris Eidhof [EMAIL PROTECTED] wrote:
Given all these issues, I consider the only reasonable option is to
discard the Prelude entirely. There will be no magic modules.
Everything will be an ordinary library. HOFs like
Given all these issues, I consider the only reasonable option is to
discard the Prelude entirely. There will be no magic modules.
Everything will be an ordinary library. HOFs like (.) are available
from Control.Function. List ops come from Data.List. Any general
abstractions can be added in
Don't spend too much time on the various libraries though. I tried
some simple things with Haskell and XML, but I found it really hard
to actually parse a simple document. You really don't want to write
your own parser.
The only tool that worked for me was HXT, which is based on arrows.
, Chris Eidhof [EMAIL PROTECTED] wrote:Don't spend too
much time on the various libraries though. I tried
some simple things with Haskell and XML, but I found it really hard
to actually parse a simple document. You really don't want to write
your own parser.
The only tool that worked for me was HXT
Hey everyone,
we added some examples to this page. There are some topics that don't
have any examples, notably:
# 11 Network Programming
# 12 XML
* 12.1 Parsing XML
# 13 Databases
* 13.1 MySQL
* 13.2 PostgreSQL
* 13.3 SQLite
# 14 FFI
* 14.1 How to interface with C
If
Hey,
you're almost there:
drop :: Integer - [a] - [a]
drop 0 xs = xs
drop n (x:xs) = drop (n-1) xs
Your version fails when trying to do drop 10 [1..10]. My version
fails when trying to do drop 10 [1..9], so you might want to try to
see if you can come up with a solution for that!
Good
The definition of myLen says:
myLen [] = 0
The length for an empty list is zero
myLen (x:xs) = 1 + myLen xs
The length of a list containing x and some other stuff (xs) is 1 +
(the length of the other stuff).
So basically, if you've got a list [1,2,3], it will try to do this:
myLen
The cool thing about Excel is that it's like Function Reactive
Programming. When you update the value of a cell, all the other cells
that reference to it get updated too. That's pretty cool to have in
GUI's as well, and Haskell has that too. See [1].
-chris
[1]:
Haskell is _not_ inherently hard - any more than any other
programming language. But it is different. So right now,
Haskell is hard only because we need more
documentation that is designed to make Haskell
seem easy.
Well, I think it's harder to get a program compiled in Haskell than
in Java,
Yes, I'm curious too. For example, it would be great if we could
change a function that uses map almost automatically to a function
that does the map in parallel. Ofcourse it should be in the IO monad,
so maybe mapM would be a better choice to start with.
-chris
On 25 Jan, 2007, at 21:13
what is so great about currying?
What are its uses, apart from letting one define functions with less
parentheses?
Well, from an academic viewpoint, it's very interesting to see a
function defined as a composition of functions. From a practical
viewpoint, it's just really handy. It saves you
profiling support to a Cabal lib is to add -
p at configure time (ie runhaskell Setup.hs configure -p). Have
you tried this?
Cheers,
Spencer Janssen
On Jan 8, 2007, at 4:13 PM, Chris Eidhof wrote:
Hey all,
I'm trying to profile my application, which makes use of MissingH.
But when compiling
Hey,
does anyone know about this? Resending as I got no replies (yet) ;)
Thanks,
-chris
On 8 Jan, 2007, at 23:13 , Chris Eidhof wrote:
Hey all,
I'm trying to profile my application, which makes use of MissingH.
But when compiling with -prof -auto-all, I get the following error
Hey all,
I'm trying to profile my application, which makes use of MissingH.
But when compiling with -prof -auto-all, I get the following error:
Language.hs:8:7:
Could not find module `Data.String':
Perhaps you haven't installed the profiling libraries for
package
== Deserialization ==
HAppS periodically checkpoints application state to disk.
Developers may want to add or remove fields from their state types
for from data types used by their state types. The current
solution is to have the developer assign a version number to
state. If state
Hey Mark,
How can I concisely compose these functions without having to write
a cascade of case statements such as:
case f1 rec1 of
Nothing - return Nothing
Just id1 - do
rec2 - f2 id2
return $ case rec2 of
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