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00:09 Kaylin: Dear #racket denizens, I seem to be stuck on a homework problem, so I don't want anyone to give me the answer but I would like to understand why this doesn't work as I expect it to. (link:  http://pastebin.com/C1Eh2pCB ) it assumes the input is well formed and contains no duplicate pairs for people who might bother me about that. There are some sample inputs in the comments which confused me greatly. I want to count all the pairs of form (x
00:10 offby1: 42
00:10 Kaylin: :(
00:11 didi: Kaylin: What should it do?
00:11 offby1: it's confusing enough that'd it take me some effort to pick through it
00:13 offby1: I have no idea what it's _supposed_ to do, so I cannot possibly answer "why doesn't this work".
00:13 offby1: It'd be good if there were some tests.
00:14 offby1: Then I could easily run it and watch the test fail
00:14 Kaylin: I'd expect it to return #t if there are the same number of pairs (a a) (b b) etc as there are elements the relation is defined over, so if it's defined over (a b c d) I'd expect it to return 4 if the relation contains 4 suck pairs (a a)(b b)(c c)(d d) and there are some tests, at the bottom of that paste
00:14 Kaylin: lines to - 29
00:14 Kaylin: 20*
00:14 Kaylin: 20-29*
00:14 didi is confused
00:14 didi: :^(
00:15 offby1: did you ever define "collect-elements-without-duplicates"?
00:15 Kaylin: yes
00:16 Kaylin: I forgot to paste that, it juse uses the built in functions
00:16 Kaylin: (define collect-elements-without-duplicates (lambda input-relation
00:16 Kaylin: (remove-duplicates (flatten input-relation))))
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00:17 offby1: OK, now the "tests" run and give the values that you included.  (Although I'm not sure those are the values you _expected_).
00:17 offby1: But I still have no idea what the functions are supposed to do, nor how their behavior differs from what you expect.
00:17 didi: Kaylin: Why do you use "rest" arguments?
00:17 Kaylin: they are, except I hoped that the top input would return #t, because 4 is equal to 4
00:18 Kaylin: didi am not sure what you mean I am not exceptionally familiar with this, sorry.
00:19 didi: rudybot: (define foo (lambda bar bar))
00:19 rudybot: didi: your sandbox is ready
00:19 rudybot: didi: Done.
00:19 didi: rudybot: (foo 1 2 3)
00:19 rudybot: didi: ; Value: (1 2 3)
00:19 offby1: You omitted some parens around "input-relation" in the definition of reflexive?
00:19 offby1: I wonder if that's the problem
00:19 Kaylin: it might be, I will look at it again
00:19 offby1: yep
00:20 offby1: the lesson is: write unit tests as you go.
00:20 offby1: I haven't tried in a while but I hear that racket has really nice unit test support.
00:20 didi: Kaylin: You use (define foo (lambda bar ...)), so `bar' will be a list of the arguments.
00:20 offby1: I bet that, if you'd been writing tests as you went, you'd have noticed the problem earlier, and would have had a better chance of spotting the problem yourself
00:21 offby1 waggles his finger
00:21 didi: Kaylin: If you expect to receive a list anyway, why not (define foo (lambda (bar) ...))
00:22 Kaylin: *shrug* idk there, I'm new. is it preferred?
00:22 Kaylin: I mean not new to this channel but I mostly lurk
00:23 Kaylin: I just thought it was kind of cool when I took a class with this language spring quarter last year.
00:23 didi: Kaylin: It's just that I don't think you meant to use (lambda bar ...).
00:23 didi: (lambda (bar) ...) seems more appropriate here.
00:23 Kaylin: yes that was the error
00:24 Kaylin: thank-you all btw
00:29 didi: Kaylin: Also, although there is nothing wrong with it, (define (foo bar) ...) is more pleasant to read than (define foo (lambda (bar) ...))
00:31 didi: A little syntax sugar will not cancer. ;^)
00:31 didi: not [cause] caner.
00:31 didi *sigh*
00:31 offby1 cackles cruelly
00:32 offby1: "Syntactic sugar causes cancer of the semi-colon" -- Alan Perlis
00:32 Kaylin: >_>
00:32 offby1: <_<
00:32 didi: ^_^
00:32 Kaylin: v_v
00:32 offby1: 💩
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00:32 didi: Bad font.
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00:36 offby1: https://www.dropbox.com/s/9sjkdk9016h5cbg/My%20New%20Avatar.png
00:36 offby1: same character, enlarged
00:37 didi: I think I know what it is supposed to be, but it looks more like a chocolate ice cream to me.
00:39 SamB_MacG5 wonders why he doesn't get a thumbnail of that image
00:40 Kaylin: because it's a shitty image =/
00:40 didi: Aaaah, /me misses fsbot
00:41 didi: ,rimshot
00:41 SamB_MacG5: he's still snacking happily away in #emacs
00:42 didi: Little devil.
00:42 didi: rudybot: What do you think?
00:42 rudybot: didi: A better question would be: does gnus think my pants are too tight
00:42 didi: rudybot: Do grab fsbot.
00:42 rudybot: didi: eh.  but you can't grab 120,000 free-$2 apps for the iTablet  :P
00:44 offby1: didi: I know.  Soft-serve.
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01:04 creep: hello
01:05 creep: i really liked the makeinstall thing that used up 2.3GB memory and 100% cpu for a few hours
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02:25 asumu: creep: you can disable the documentation if you don't want to build it. Or just use the binaries.
02:25 creep: well, they are compiled now
02:25 creep: no idea how and what it does yet
02:26 creep: but i think i'd be good with a simple txt documentation
02:27 creep: maybe the documentation needs optimizations?
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02:33 didi: asumu: Disable documentation? Never!
02:34 asumu: I like docs too, but I usually read them from pre.racket-lang.org.
02:34 didi: `raco docs' ftw!
02:34 didi: asumu: I'm addicted to `raco docs'.
02:34 asumu: I have a browser shortcut set up for 'r' -> racket docs in the address bar.
02:35 didi: asumu: stumpwm command here.
02:35 didi: Or geiser.
02:35 didi: Also, .desktop file.
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02:58 whiteout: Hi! I have a problem on WinXP: impossible to change languages by "ALT-SHIFT" (or CTRL-SHIFT)  in DrRacket. If there anyone have the same troubles?
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03:25 mye: whiteout: I do not understand what your exact issue is
03:26 mye: why can't you use the select language menu?
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03:41 whiteout: mye: of course I can, but  there must be a more handy way
03:44 whiteout: oh, I mean that I cannot switch language of input: englihs - russian and vice versa
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03:46 mye: whiteout: oh you mean the keyboard input language
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03:47 whiteout: Yes. And, when I use racket/gui and create a frame% with editor% and text% inside - see the same
03:47 mye: well, shouldn't that keyboard shortcut be handled before drracket even sees it, e.g. by windows?
03:48 mye: If you see it only with racket/gui the maintainers are reachable on the mailing list
03:48 whiteout: You mean, does it works before I start drracket? Yes, it works fine before and in other windows
03:49 whiteout: see: russian - русский
03:49 whiteout: I 've done it by ALT-SHIFT
03:51 mye: whiteout: you can also file a bug report from drracket
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03:55 whiteout: Ok, I'll create a bug report from DrRacket
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04:20 Gertm: Can I compile racket on my raspberry pi?
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07:08 bremner: Gertm: does it build in Rasbian?
07:10 Gertm: bremner: I use the Arch-based rpi distro.
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07:11 Gertm: And no it doesn't build. ./sighand.c:65:15: error: dereferencing pointer to incomplete type
07:13 bremner: sounds like some work is necessary to get it building. It does build on other arm variants (whatever mainline debian supports).
07:13 bremner: Cross compilation might be an option, dunno.
07:16 Gertm: Too bad, I really wanted to use this on my rpi.
07:16 Gertm: Might need to look in to chicken or so now.
07:19 bremner: fwiw debian has 5.3 on armel and armhf
07:20 bremner: if you like that kind of hacking, people on the devel list (especially Mathias) are helpful.
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10:26 samth: wow, greg's google API package is impressive!
10:28 eli: samth: Did you get it to work?
10:34 samth: haven't tried yet, was just reading the docs
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10:42 samth: eli: it breaks at the repl for me, but works in a module
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10:49 SamB_MacG5: eli: can you take a look at https://github.com/SamB/racket/commit/16eade9ccdbb3b0e43cc49cf320002542be62b6f and http://jsbin.com/okizeb/2 ?
10:49 rudybot: http://tinyurl.com/bpyobdw
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10:58 eli: SamB_MacG5: Did it really change meaning three times??
10:58 SamB_MacG5: eli: three times? I don't think so ...
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10:59 SamB_MacG5: NFC is an algorithm from unicode
10:59 eli: The first three rows in thathtml table have different characters
10:59 SamB_MacG5: the NFC of something is supposed to have the same meaning as the thing
10:59 eli: In any case, feel free to open a pull request if you think that it's fine..
11:00 SamB_MacG5: I'll have to check the browsershots that I requested of the test page, I guess ...
11:00 SamB_MacG5: make sure it didn't screw up anywhere
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11:04 creep: so everybody uses racket for computing homework and not for actual real life programs?
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11:04 SamB_MacG5: anyway, it seems that HTML 4.1 had used what turned out to be legacy CJK characters for it, which canonicalized to full-width characters
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11:04 SamB_MacG5: (Well, ended up canonicalizing to full-width characters)
11:06 SamB_MacG5: so Unicode broke it, and they fixed it again
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11:07 eli: samth: I get a: file-size: file not found; path: /home/eli/.google-api-key
11:07 asumu: creep: people certainly do use it for real life programs.
11:08 eli: (And doing that is beyond my current mental capabilities.)
11:09 creep: asmcan you state a few? ;)
11:09 creep: asumu
11:10 asumu: creep: Naughty Dog uses it to script video games. A bunch of people use it for web related things.
11:10 samth: eli: you need an api key
11:10 samth: as it says in the docs
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12:18 dyoo: When building the repo from scratch, I'm seeing a collects/tmp directory where things are being built.  Why is tmp used?
12:20 samth: dyoo: i'm surprised by that
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12:24 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/LpNp3g
12:24 RacketCommitBot: [racket/master] add another argument to `{chaperone,impersonate}-prompt-tag' - Matthew Flatt
12:24 (part) RacketCommitBot
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12:53 samth: jeapostrophe: ping
12:56 jeapostrophe: samth: pong
12:57 jeapostrophe: 4 minutes before class
12:57 jeapostrophe: what's up?
12:57 samth: jeapostrophe: in your mongodb lib, how can i get back a mongo-db-struct that i've created
12:57 jeapostrophe: i'd have to look... h/o
12:57 samth: as in, in the quickstart example:
12:57 samth: http://planet.racket-lang.org/package-source/jaymccarthy/mongodb.plt/1/12/planet-docs/mongodb/Quickstart.html
12:58 rudybot: http://tinyurl.com/bo8esze
12:58 samth: what do i do to get `p` back?
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12:58 jeapostrophe: you can't get back the same one, but you could do an dict-query and return one that is the same object
12:59 jeapostrophe: lke (mongo-dict-query ... (hasheq 'title ....))
12:59 jeapostrophe: and how do you make it a post... let me check
13:00 samth: do you have any code on github that does something like this?
13:00 jeapostrophe: ah, that's the collection it is from
13:00 jeapostrophe: yes
13:00 jeapostrophe: m8b
13:00 jeapostrophe: in the model.rkt
13:00 jeapostrophe: after class (noon) i can come back and give more info
13:00 jeapostrophe: peace
13:01 samth: thanks!
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13:05 dyoo: anyone else seeing build problems off the plt/release branch?
13:05 dyoo: I'm seeing compile-time errors in order.rkt
13:05 dyoo: this can't just be my machine, right?
13:06 (quit) mithos28: Quit: mithos28
13:06 dyoo: I'm seeing errors that look like this: https://gist.github.com/3906754
13:09 dyoo: I'm at 513f85baa2051cd7428ac008e5b2d1e6858f52d6
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13:14 didi: On a side note, it's interesting how many different workflows there are for git projects. Some like to encourage living on the edge with master. On the other hand, Linus get upset if you do this kind of stuff with his branch of the kernel.
13:15 dyoo: I do not like having either the master or release branches produce errors at build time… :(  If it's going to break, make it a parallel branch.  I was so unhappy because one of the beginning phd students here is trying to start developing a new racket feature.  I had to tell her to work off of 5.3 rather than master tip because nothing would build
13:16 mithos28: dyoo: This is because people don't test before checking in
13:16 didi: dyoo: What's wrong with 5.3? It's the release, after all.
13:17 mithos28: didi: Because it is old
13:18 didi: mithos28: Well, I don't know how Racket feels about its development process, but the normal case is to build onto releases.
13:20 mithos28: I always build on HEAD for both racket and work. How else do you get bug fixes that are blocking you, patching them back?
13:20 didi: As I said, some projects really encourage leaving at master and only do releases because it feels forced to.
13:20 didi: mithos28: You cited a very specific case.
13:21 mithos28: bug fixes are a specific case?
13:21 didi: mithos28: "bug fixes that are blocking you, patching them back?"
13:21 didi: This is a specific case.
13:22 didi: You have a bug. And it's blocking you. And you want to patch it back.
13:23 mithos28: patching it back is the solution, not the problem. And if you have a bug then by definition it is hindering you, otherwise you just found and reported the bug
13:23 mithos28: I may be biased because all my racket work is bug fixes
13:23 didi: I think you are.
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13:24 samth: mithos28 also pushes on racket pretty hard (for which we love him), so that may necessitate using more recent builds
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13:25 didi: I understand. And I'm not saying anything against workflows that encourage using the software out of the development branch.
13:27 dyoo: didi: about 5.3, yup.  Eventually we just went back to it and worked off of 5.3.  But it was a bit embarrassing to say that the Racket development branch was not buildable: that just sounds wrong to me.  If I'm developing on Racket, I want to be able to run the test cases so I can push with confidence.  I can't do that right now.
13:28 mithos28: Just make it so that if the build is broken no one can check in code, other than to fix it
13:28 mithos28: Very effective at making people not break the build
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13:32 soegaard_: dyoo: You mention  513f85baa2051cd7428ac008e5b2d1e6858f52d6 how is one to find the correspoing drdr entry?
13:32 soegaard_: http://drdr.racket-lang.org/
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13:33 soegaard_: Found it! http://drdr.racket-lang.org/25481/
13:33 dyoo: soegaard: ok, cool
13:33 dyoo: how did you find it?
13:34 soegaard_: I clicked the first line at: http://drdr.racket-lang.org/25489/
13:34 soegaard_: Then I discoverede the arrows on top.
13:35 soegaard_: Which are much easier to use, than going back to the home page.
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13:35 soegaard_: But maybe drdr hasn't caught up to the commit breaking the build?
13:36 dyoo: I just want to confirm with someone else that they see the build problems too; I just want to make sure it's not just my computer doing something unreproducable.  :)
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14:02 soegaard_: dyoo: I just built the head from github without any problems.
14:03 dyoo: nuts.  What could I be doing wrong then?
14:03 dyoo: I'm doing basically: "git clean -fdx" "cd src" "mkdir build" "cd build" "../configure && make && make install"
14:03 soegaard_: Try cloning into a new directory
14:04 soegaard_: At least just to see if that builds correctly.
14:04 dyoo: I believe -fdx should be equivalent to cleaning out everything, even stuff in .gitignore, so that should be equivalent to a fresh git clone, right?
14:04 dyoo: But I'll try it anyway and put it in the background.  Thanks!
14:04 soegaard_: FWIW I am on OS X.
14:05 dyoo: same; I got a shiny new macbook air when I moved to Utah
14:06 soegaard_: I haven't updated to the latest xcode yet - but the error you pasted looks as if it is Racket related, so that ought to be unimportant.
14:06 soegaard_: Love my Air to :-)
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14:30 dyoo: soegaard: nope, I still see the same errors on raco setup time
14:30 dyoo: … wait!
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14:31 dyoo: Why in the world is raco setup walking over my existing local/racket collection?!
14:32 dyoo: I checked out a clean copy in /Users/dyoo/local/official-racket, but I see in raco setup that it's walking over things that it should not know about, namely /Users/dyoo/local/racket/... !!
14:33 friscosam: maybe you have some environment variables set?
14:35 SamB_MacG5: dyoo: did you run "raco setup" or ./<relative-path-here>/bin/raco setup
14:35 dyoo: … holy moley.  find-system-path is doing something very weird for me.
14:35 dyoo: give me a sec.. trying to trace it down.
14:36 SamB_MacG5: soo ... aren't there, like, build bots of some kind?
14:37 dyoo: let me try building one more time and make sure I'm measuring what I think I'm measuring.
14:37 dyoo: There is a build bot called drdr.racket-lang.org
14:37 dyoo: That's why I'm really confused, and why I think it must be something specific to my machine.
14:37 SamB_MacG5: does it build the release branch? what OS does it use?
14:37 dyoo: I hate free variables.  :)
14:37 SamB_MacG5: also, did you run "printenv" yet?
14:38 friscosam: we should add "subscription" variables.  I don't know what they would do, but they should cost more to use :)
14:39 SamB_MacG5: they look for new values in RSS feeds
14:39 SamB_MacG5: that should be costly enough ;-P
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14:40 didi: dyoo: They are lovely when you're doing edit tasks on Emacs. ;^)
14:41 dyoo: SamB_MacG5: Mac OS 10.8.2, trying to build the plt/release branch off the git repo.
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14:49 SamB_MacG5: sorry about that ... I seem to have PINGed out due to excessive memory pressure ...
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14:50 SamB_MacG5: last I saw was dyoo saying he's trying to build plt/release on 10.8.2
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15:06 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/65zmig
15:06 RacketCommitBot: [racket/master] adding examples for sequences - Danny Yoo
15:06 RacketCommitBot: [racket/master] Tidy things up. - Eli Barzilay
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15:13 soegaard_: dyoo: Do you have Planet development links pointing to odd places?
15:13 dyoo: sorry, busy at the moment; will be back in a few minutes!
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15:20 dyoo: back; ok, so if I check the repository clean, things are fine.  For some reason, my repository in ~/local/racket has state that isn't cleaned up under a "git clean -fdx"
15:21 jonrafkind: what does -fdx do
15:21 dyoo: It's supposed to clean really "f"forcefully, on "d"irectories, and ignoring the ".gitignore".  No clue why they chose 'x' as the flag there.
15:24 dyoo: … oh.  Now that's weird.  git clean -fdx isn't actually doing enough.  It's leaving behind a deitrus of stuff in collects/tmp.
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15:25 dyoo: Ok, resolved.  I have no idea how this happened, but there ended up being a copy of the git repository in a directory called collects/tmp
15:26 dyoo: and somehow that polluted my build.  What a weird bug.  And git clean won't go kill it because it looks like an external git repository.
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15:29 soegaard_: perhaps you need a "git reset" too, when you clean a directory
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15:35 dyoo: Ok, I wrote up my experience on a thread in racket-dev.  Hopefully no one else will hit this again.  Back to work (and lunch!)
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15:36 didi . o O (mmmm, lunch...)
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16:45 samth: eli: ping
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17:37 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/H7YFww
17:37 RacketCommitBot: [racket/master] Additional random test generation capability for Redex. - Burke Fetscher
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17:38 jonrafkind: 3/27 lol
17:42 samth: gf3: https://github.com/samth/rktbin/blob/master/main.rkt
17:42 samth: gf3: it works (no forking yet), not quite pretty enough
17:42 samth: gf3: prettyness heavily ripped off from cljbin
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17:51 (nick) elliottcable -> elolittcable
17:55 asumu: samth_away: is that running somewhere where I can see it?
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18:23 danl-ndi: how do I reference stdout in racket?
18:24 danl-ndi: (current-output-port)
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18:29 RacketCommitBot: [racket] plt pushed 4 new commits to master: http://git.io/PT78EQ
18:29 RacketCommitBot: [racket/master] fix planet `raco exe' tests - Matthew Flatt
18:29 RacketCommitBot: [racket/master] fix `raco exe' for `module+' submodules - Matthew Flatt
18:29 RacketCommitBot: [racket/master] update change history for v5.3.1 - Matthew Flatt
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20:27 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/5EZbBg
20:27 RacketCommitBot: [racket/master] fixed Adam Shaw's typo, eliminated the word match - Matthias Felleisen
20:27 RacketCommitBot: [racket/master] fix string-ith's error message; Closes PR 13197 - Matthias Felleisen
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20:35 gf3: samth_away: Oh boy! Amazing!
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20:58 offby1: hmm ... racket pastebin ...
20:59 offby1: rudybot: you gonna finish that
20:59 offby1: ?
20:59 rudybot: *offby1: but I should probably finish writing this stupid paper review on some xml crap rather than hunt down fun links :/
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21:01 didi: offby1: I use paste.kde.org because it has a simple external API, but codepad.org impress me.
21:02 didi: Running others code seems bold to me.
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21:19 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/xEpgcg
21:19 RacketCommitBot: [racket/master] fix group-test - Robby Findler
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21:39 friscosam: is there a function like free-vars that reports all of the #%top variables in a piece of fully expanded code?
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21:46 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/Yk0tMg
21:46 RacketCommitBot: [racket/master] drracket history updates - Robby Findler
21:46 RacketCommitBot: [racket/master] redex history release notes - Robby Findler
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22:55 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/hKhWyw
22:55 RacketCommitBot: [racket/master] avoid compiler warning - Matthew Flatt
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