YAY!
I can *never* remember this flag.
Many thanks,
John
> On Apr 25, 2018, at 9:32 AM, Matthew Flatt wrote:
>
> Branch: refs/heads/master
> Home: https://github.com/racket/racket
> Commit: bc55560f8dcef2780c2b64a95c2fc89513e3f447
>
> https://github.com/racket/racket/commit/bc55560
I did a mini-experiment today, and was surprised.
Specifically, my guess was that changing the language of a file from
#lang typed/racket
to
#lang typed/racket/base
and adding the newly-necessary requires:
(require racket/match
racket/list
racket/math)
… would result in fa
Oops forgot to cc: users. Dan, if you respond, could you respond to this one
rather than the one I sent only to you? Sorry.
John
> Begin forwarded message:
>
> From: John Clements
> Subject: Re: [racket-users] Mozart's Musical dice with rsound
> Date: March 29, 2018 at 15:24:11 PDT
> To: Danie
> On Mar 25, 2018, at 12:25, Nadeem Abdul Hamid wrote:
>
> I had a student in class the other day also complaining about sluggish
> scrolling in DrRacket (while all other applications work fine), but I think
> he was using 6.11 on Mac OS X.
> — nadeem
FWIW, I think these are probably differe
I’m fixing problems related to documentation on the libgit2 package, and it
appears there are a number of issues to fix, but the first one was that the
package was written with a main scribblings file called “manual.scrbl”. It
turns out this is a bad idea, and in fact this is mentioned in the ra
> On Mar 14, 2018, at 6:22 PM, Matthew Flatt wrote:
>
>
Would it make sense to add these two examples to the documentation? Perhaps
just as links to github gists? Apologies if they’re already there; I took a
quick look and didn’t see them.
(I suggest this selfishly, because my ‘rsound’ pa
> On Mar 9, 2018, at 8:25 AM, Tim Hanson wrote:
>
> Hi, I tried to grab the latest racket version from download.racket-lang.org
> and chrome and edge tell me the certificate of the site at
> mirror.racket-lang.org is not yet valid or expired. It's no problem as I
> found a mirror with a vali
ot;
> #f)))
> ```
>
> ~Leif Andersen
>
>
> On Mon, Mar 5, 2018 at 2:25 PM, 'John Clements' via Racket Users
> wrote:
> > I went looking for the standalone slideshow->pdf converter today, and was
> > mystified that it
I went looking for the standalone slideshow->pdf converter today, and was
mystified that it didn’t appear in the list of raco commands.
Eventually, I realized that it’s actually its own executable, and has been
since before ‘raco’ even existed.
Wouldn’t it make more sense for slideshow to be a
> Mathematics is fascinating. It's repetitive arithmetic practice that's
> completely, totally boring and designed to inculcate hatred of the
> subject.
“designed” ?
John
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To unsubscribe from
I think you might be most interested in RacketScript, available on the package
server. It compiles racket into JS.
https://github.com/vishesh/racketscript/blob/master/README.md
Haven’t used it myself, but I probably will, the next time I need something
written in JS.
John
> On Feb 10, 2018,
Wow. Yes please.
John
> On Jan 29, 2018, at 03:09, Alex Harsanyi wrote:
>
> The racket plot package produces interactive snip% objects which allow
> zooming of the plot area. While this is a cool and sometimes useful feature,
> the functionality is hard coded in the plot-snip% class inside th
> On Feb 2, 2018, at 3:21 PM, Matthew Butterick wrote:
>
>
>> On Feb 2, 2018, at 10:23 AM, 'John Clements' via Racket Users
>> wrote:
>>
>> This macro gets the names in much closer to the corresponding patterns than
>> matching by index,
Not sure if this gets you as far as you want, but you could use a macro to
associate names with paren-wrapped items:
#lang racket
(define-syntax re-match
(syntax-rules ()
[(_ str re name ...)
(match str
[(regexp re (list _ name ...))
(list (list (quote name) name) ...)]
> On Jan 25, 2018, at 12:17 PM, Philip McGrath wrote:
>
> I took the steps you described and I no longer get the doubled program
> contour, but I do get results like the screenshot of my experiment with
> text:inline-overview-mixin I sent
> earlier (maybe that's what the contour is supposed
> On Jan 25, 2018, at 8:48 AM, Jordan Johnson wrote:
>
> Hi all,
>
> One of my students is observing some strange behavior involving the Program
> Contour pane of DrRacket. He’s using v6.11 on OS X Yosemite 10.10.5.
>
> This is the top-right corner of his DrR window, with Program Contour ope
>>> On Jan 23, 2018, at 1:20 PM, Matthew Flatt wrote:
>>>
>>> At 23 Jan 2018 15:57:34 -0500, "'John Clements' via Racket Users" wrote:
>>>> despite being inside of a binding of the name map
>>>
>>> That's the essence
map '(1) add1)
>> '(2)
>>> (map '(1 2) add1)
>> '(2 3)
>>> (map '(1 2 3) add1)
>> '(2 3 4)
>>>
>
>
> — Matthias
>
>
>
>> On Jan 23, 2018, at 3:57 PM, 'John Clements' via Racket Users
Permission to paste this summary on Stack Exchange?
> On Jan 23, 2018, at 1:20 PM, Matthew Flatt wrote:
>
> At 23 Jan 2018 15:57:34 -0500, "'John Clements' via Racket Users" wrote:
>> despite being inside of a binding of the name map
>
> That's t
Stack overflow today led me to something … very strange. I feel like I must be
missing something crushingly obvious.
To reproduce: start racket at the command line or hit “run” on a definitions
window containing only “#lang racket”.
Then, paste:
(define map (lambda (l f)
(cond
((nu
I see a number of very minor issues in your code:
1) It looks like you have wrapped the keyword arguments in square brackets.
These aren’t necessary. They’re used in the documentation to indicate optional
elements.
2) It’s worth noting that these arguments are optional, so you can leave out,
ou're
> thinking of, and those cases are important for cases where you
> genuinely only know that you have a hash, and not something about the
> key/value types.
Okay, that makes sense. Many thanks for taking the time to write this up.
John
>
> Sam
>
> On Thu, Jan 11,
I was surprised and a wee bit dismayed this morning to see that this code,
using hash-ref with the wrong key type, typechecks:
#lang typed/racket
(define my-hash : (HashTable String String)
(make-immutable-hash
'(("abc" . "def")
("ghi" . "jkl"
(hash-ref my-hash 1234)
So, I printe
Very well… I concede :).
John
> On Dec 28, 2017, at 09:51, Matthew Butterick wrote:
>
>
>> On Dec 27, 2017, at 10:15 PM, 'John Clements' via Racket Users
>> wrote:
>>
>> Again, there may be a reason why this is a bad idea, but I don’t think I’ve
> >>
> >
> > If you copy and paste these from the interactions into the definitions
> > window, you can even get this:
> >
> > #lang racket
> >
> > (equal? 'hello 'hello)
> > (eq? 'hello ‘hello)
> >
> > e
ory limit: 4096 MB.
#f
#f
>
Did you misunderstand me, or did I misunderstand you?
John
>
> On Wed, Dec 27, 2017 at 3:54 PM, 'John Clements' via Racket Users
> wrote:
>> I was working with files containing a Byte Order Mark today, and in the
>> process
I was working with files containing a Byte Order Mark today, and in the process
of writing a test case, I discovered that
(string->symbol “\uFEFF”)
produces a symbol whose printed representation is
‘hello
… which seems unfortunate; I guess I would have expected something like
‘|\uFEFFhello|
Looks to me like DrR is leaking… windows.
Specifically:
On up-to-date DrR (just rebuilt from repo, version 6.11.0.5--2017-12-20),
pretty much up-to-date OS X (10.13.1 (17B1003)), I notice something very
strange. I’ve seen it on two computers, so I think it should be reproducible on
any comput
+1. Totally agree.
> On Nov 27, 2017, at 1:15 PM, Jack Firth wrote:
>
> I don't think you can directly test an inner procedure while keeping your
> test code separately loadable (e.g. different file or module). It doesn't
> seem like a good idea to me, personally. Inner procedures communicate
> On Nov 19, 2017, at 17:04, George Plymale II
> wrote:
>
> This issue still exists on High Sierra and with Racket 6.11. I even see it
> happen on the non-nightly, stable builds. It's a bit of a hassle to have to
> do the drag-n-drop dance every single time I update Racket. I'm we would all
Update on this; it definitely has nothing to do with DrRacket, I can reproduce
it directly in Racket with a frame% wrapper. Also, thanks to Northwestern’s
lengthier nightly snapshot trail, I’ve discovered that the regression was
apparently introduced between 6.10.1.1 and 6.10.1.2, although it’s
n the gui library.
John
>
>
> Robby
>
> On Thu, Nov 16, 2017 at 5:55 PM, 'John Clements' via Racket Users
> wrote:
>> Since the release of 6.11, it appears there’s been a major major performance
>> regression in the display of 3d plots in the inter
Since the release of 6.11, it appears there’s been a major major performance
regression in the display of 3d plots in the interactions window.
To see this, try running this program (from the plot docs), then try to drag
the image around.
On a fresh download of the snapshot, dragging is unusable
> On Nov 8, 2017, at 12:42, Robby Findler wrote:
>
> How about "env X=Y racket -l- drracket file-to-open-in-drracket.rkt” ?
+1
John
--
You received this message because you are subscribed to the Google Groups
"Racket Users" group.
To unsubscribe from this group and stop receiving emails f
> On Nov 8, 2017, at 8:31 AM, Matthew Butterick wrote:
>
> The `(current-environment-variables)` visible in command-line `racket` seem
> to be exactly what I see when I just do `env` in the shell. Makes sense.
>
> But the `(current-environment-variables)` in DrRacket differ quite a bit:
> som
, IIUC. Probably easiest just to dig up an older
version of Racket to install this .plt file.
John
> On Nov 2, 2017, at 3:46 PM, 'John Clements' via Racket Users
> wrote:
>
> I’m surprised by this interaction with raco planet:
>
> % raco planet open ../margr
I’m surprised by this interaction with raco planet:
% raco planet open ../margrave3-dev-0203.plt .
cannot install; version (400) of collection ("mzscheme") is required, but
version is installed
context...:
/Users/clements/racket/racket/collects/setup/unpack.rkt:408:31: loop
/Users/cleme
> On Nov 2, 2017, at 9:35 AM, Geoffrey Knauth wrote:
>
> Let's suppose I want to have a preferences file, e.g., "~/.dbaccess.rkt". I
> used to have a module I would import via
> "../some-relative-path/dbaccess.rkt", but I thought I would try
> "~/.dbaccess.rkt" as a module path. It turned o
Thanks to Andreas Per Olsson’s post on the Racket Facebook group, I found out
about this link
https://github.com/trending/racket?since=monthly
which lists the Racket repos that are “trending”. I think this has something to
do with the number of stars it has. Anyhow… interesting information.
Jo
> On Oct 29, 2017, at 15:35, Robby Findler wrote:
>
> On Sun, Oct 29, 2017 at 5:31 PM, John Clements
> wrote:
>>
>>> On Oct 29, 2017, at 15:27, Robby Findler
>>> wrote:
>>>
>>> I think it is a bad idea to dump output into the interactions that
>>> isn't being printed by the program.
>>
>>
erhaps that can be used?
>
> Robby
>
>
> On Sun, Oct 29, 2017 at 5:25 PM, 'John Clements' via Racket Users
> wrote:
>> This is a great idea: I feel like this change would deliver 80% of what I
>> want, and be easy to implement. It would give a concrete and
This is a great idea: I feel like this change would deliver 80% of what I want,
and be easy to implement. It would give a concrete and recognizable visual
“path” of the compilation. I would not be inclined to delete it when finished.
Could it ever be long? Would it make other people unhappy to s
Okay, this is just what the world needs…another DrRacket GUI suggestion. If it
makes sense, though, I’d love to help implement it.
If there’s anything that the last 30 years of UI (oh… sorry… UX) design has
taught us, it’s that people hate to wait, and they REALLY hate to wait when
they have no
Okay, this might now be done. You should be able to install it using
raco pkg install simply-scheme
OR you can use the package manager from within DrRacket.
MAJOR disclaimer: I am not a user of Simply Scheme, and this package does not
appear to include any tests.
However, it appears that
(+
Okay, I spent half an hour on this, and I think I’m done… um, almost.
Actually, it appears that my quick job of updating the drracket tool has
resulted in a configuration that can reliably make DrRacket seg fault (!).
Since this package does not involve FFI in any way, this is a bug in DrRacket,
The documentation currently states:
"When DrRacket starts up, it looks for tools by reading fields in the info.rkt
file of each collection and the newest version of each PLaneT package installed
on the system. (Technically, DrRacket looks in a cache of the "info.rkt" files
contents created by r
> On Oct 22, 2017, at 16:05, Neil Van Dyke wrote:
>
> I could be missing something, but I think a filename completion procedure
> (not the DrRacket integration part) might be a doable exercise for a budding
> Racket programmer, so long as they already have a basic familiarity with
> using the
> On Oct 22, 2017, at 04:30, Gour wrote:
>
> On Thu, 16 Mar 2017 02:04:53 -0700 (PDT)
> Vincent Nys wrote:
>
>> Congrats! I've gone through all the chapters and it has been the most
>> entertaining programming book I have ever read. It's been practical,
>> too, as I have already used bits of i
> wrote:
> Do you want drr to open the files? If so, is cmd-shift-O followed by typing
> an open double quote close enough?
>
> Robby
>
> On Fri, Oct 20, 2017 at 11:42 AM 'John Clements' via Racket Users
> wrote:
>
> > On Oct 20, 2017, at 8:06 AM, Vince
> On Oct 20, 2017, at 8:06 AM, Vincent St-Amour
> wrote:
>
> That page is pretty out of date.
>
> This list is more focused on contributing to Racket itself, but is more
> up to date. It was compiled for the "office hours" portion of the last
> RacketCon, ~2 weeks ago.
>
> https://github.com
Lovely! I was thinking along these lines, but you hit it out of the park.
Sounds like you must be avoiding some really important task!
John
> On Oct 14, 2017, at 11:31, Ryan Culpepper wrote:
>
> On 10/14/2017 05:01 AM, George Neuner wrote:
>> On 10/14/2017 3:00 AM, Jack Firth wrote:
>>>
>>>
Like many of you, I’m looking forward to attending RacketCon this year. Before
I buy plane tickets, though, I’m wondering if we have some thought about what
the hours of Sunday’s “Office Hours” will be. Thoughts?
Can’t wait!
John
--
You received this message because you are subscribed to th
> On Sep 7, 2017, at 9:28 AM, jaroslaw.mo...@gmail.com wrote:
>
>
> Dear Racketeers!
>
> I would like to write the function divide in racket, for performing the long
> division, which would print the whole computational process, as the
> elementary school pupils do. For example, the call (div
I’m amused to report that I’ve organically captured what appears to be a
substantial fraction of the google search traffic for the phrase “racket
sucks”. Since last December, I have about 1,200 visits to my blog post
https://www.brinckerhoff.org/blog/2016/04/25/racket-sucks-don-t-try-it/
…inclu
> On Jun 29, 2017, at 17:33, Zelphir Kaltstahl
> wrote:
>
> A while ago I started looking at Typed Racket and today I took a look again.
>
> The documentation says:
>
>> Typed Racket provides modified versions of core Racket forms, which permit
>> type annotations. Previous versions of Typed
> On Jun 2, 2017, at 14:44, 'Ross Mckinlay' via Racket Users
> wrote:
>
> On Friday, June 2, 2017 at 10:38:35 PM UTC+1, johnbclements wrote:
>>> On Jun 2, 2017, at 2:32 PM, 'Ross Mckinlay' via Racket Users
>>> wrote:
>>>
>>> Hello Racketeers!
>>>
>>> I just released an early version of my f
> On Jun 2, 2017, at 2:32 PM, 'Ross Mckinlay' via Racket Users
> wrote:
>
> Hello Racketeers!
>
> I just released an early version of my first real Racket project, which
> extends Racket to become a 6502 assembler. Thought I would share it here:
>
> http://pinksquirrellabs.com/blog/2017/05/
> On May 27, 2017, at 07:00, A Mauer-Oats wrote:
>
> Does anyone use array data with the Universe teachpack?
>
> I thought it would be interesting to work with 2D data in an "advanced
> introductory" class. At least to the extent of being able to model classic
> board games like Battleship an
> On May 25, 2017, at 3:49 PM, Matthew Flatt wrote:
>
> At Thu, 25 May 2017 18:28:16 -0400, "'John Clements' via Racket Users" wrote:
>>> On May 25, 2017, at 3:27 PM, Jon Zeppieri wrote:
>>> Immutable hash operations are logarithmic, not constan
> On May 25, 2017, at 3:27 PM, Jon Zeppieri wrote:
>
> On Thu, May 25, 2017 at 6:16 PM, 'John Clements' via Racket Users
> wrote:
>> Following up on a discussion I had with another teacher here, I decided to
>> briefly investigate the running time of in
> On May 25, 2017, at 3:20 PM, Ben Greenman wrote:
>
> Is the y-axis on the first plot labeled correctly? It's reporting fractions
> of a millisecond, but the text talks about 7 vs. 40 seconds.
Yes, I believe that’s correct: the 7 seconds is for constructing the table of
10 million elements,
Following up on a discussion I had with another teacher here, I decided to
briefly investigate the running time of insertion and deletion on mutable vs
immutable hash tables. I was a bit disappointed to find that it turns out that
insertion really doesn’t look very constant-time for insertion… o
> On May 16, 2017, at 11:26 AM, Robby Findler
> wrote:
>
> If you have control of the language<%> class, then you can do that via
> the on-execute method. If you want to do that for all languages (which
> is probably not a good idea, but you could use this approach and limit
> it to a known set
> On May 16, 2017, at 11:23 AM, Vincent St-Amour
> wrote:
>
> John, Austin,
>
> You can use loggers for this. The `data` argument to `log-message`
> allows payloads to be carried along with log messages. Just have the
> user program log messages with a particular topic, and have the tool
> lis
Austin Sparks (cc:ed) and I are struggling with what I believe should be a
pretty simple problem; how can we share a value between a DrRacket tool and a
user’s program? Specifically, the value in question here is a channel (probably
an asynchronous channel) on which the user’s thread can place
If someone hasn’t already done this, I’ve got a few CS Ed papers for sure….
I’m looking at Python now, but this should be much easier in Racket: I’d like
to put together a simple syntax for unenforced data definitions and signatures,
then use instructor help to map these to course-specific quick
> On Apr 29, 2017, at 11:36, Philip McGrath wrote:
>
> After upgrading to 6.9, I'm getting the following "DrRacket Internal Error"
> when I try to open the preferences menu on MacOS:
>
> preferences:get: tried to get a preference but no default set for
> 'scribble-reindent-paragraph-width
>
This nightmarish but organic example produced by a student actually works
correctly, and is a beautiful example of why we need teaching languages (or a
type system that enforces boolean inputs to ‘or’):
https://www.brinckerhoff.org/blog/
Note that while the actual student code is in python, it’
> On Apr 25, 2017, at 4:05 PM, brendan wrote:
>
> Indeed; I should have clarified that I didn't mean only recursion per se. Not
> the first time I've stumbled on that misnomer.
Forgive me. In that case, I’m not sure exactly what property it is you’re
looking for a name for.
:)
John
--
> On Apr 25, 2017, at 3:37 PM, brendan wrote:
>
> Scheme implementations are required to have proper tail recursion. Racket
> goes further and lets the programmer make recursive calls from any position
> without fear because, to paraphrase Dr. Flatt, it's the 21st century and
> stack overflow
> On Apr 21, 2017, at 18:34, Cleverson Casarin Uliana
> wrote:
>
> Hello, I need playing/stopping a given audio file (may be wav, ogg, etc.),
> checking whether the sound is still playing, and stop it/start a new sound
> upon a key press. Is there support for it, prefferably using the OS nati
> On Apr 14, 2017, at 6:05 AM, Matthew Flatt wrote:
>
> I don't didn't find any other workaround.
>
> I think it makes no sense to treat an `_` prefix specially in
> `defmodule`, `racketmodlink`, etc. (and it wasn't really a good idea
> for `racket`), so I've pushed a change to Scribble to disa
There are several things about the excellent scribble guide at
http://docs.racket-lang.org/scribble/getting-started.html
that appear not to have been edited since the pre-Butterick era. Since this is
now year B3 or B4, it seems high time to edit them.
Specifically, the documentation manages to
> On Apr 9, 2017, at 15:14, bsdm wrote:
>
> Hey everyone, I"m new to the racket language and was wondering if anyone can
> help me explain keyboard movement for an image I'm using for a game I'm
> trying to make. And yes I know there's a documentation page for it, but I'm
> having trouble fig
> On Apr 7, 2017, at 08:33, Konrad Hinsen wrote:
>
> Now available for your friendly Racket installation: Leibniz, a digital
> scientific notation
>
> What's a digital scientific notation? For those who come from a programming
> language background, it's a specification language for scientifi
It looks like pkgn.racket-lang.org has two different GitHub API repos, and
neither of them has been updated since 2015. One is Sam’s, one is from a fellow
named Stefan. In addition, it looks like Tony forked Sam’s repo.
Can any of you comment on which of these is the most likely to be working to
?
I’m not aware of any others. (it’s true, I didn’t really answer your
question….) I will say that the error message simply suggests that another
typed import is needed.
John
>
>
>
>> On Mar 28, 2017, at 12:38 PM, 'John Clements' via Racket Users
>> wrote:
>&
Someone on stack overflow just discovered that “check-random”—from Kathy Gray’s
teaching language test framework—doesn’t work with TR. It looks like this is
because no one bothered to implement it. I suggested that they change to
rackunit, instead, and provided them with this quick hack version
> On Mar 22, 2017, at 12:45 PM, Angus wrote:
>
> I am a bit stuck on rendering images in a list.
>
> Here is my code below.
>
> (require 2htdp/image)
>
> (define-struct bear-state (x y rotation size))
>
> (define MTS (empty-scene WIDTH HEIGHT))
>
> BEAR-IMAGE is just a graphic - of a bear.
It looks to me as though this error may have nothing to do with beautiful
racket, and that beautiful racket may have installed successfully.
In particular, it looks like an error occurred while building the docs for
‘unlib’, and that the ‘unlib’ library is something that you had installed
previ
> On Mar 3, 2017, at 12:02 PM, Daniel Prager wrote:
>
>
>
> On Sat, Mar 4, 2017 at 6:21 AM, John Clements
> wrote:
>
> > On Mar 2, 2017, at 3:00 PM, Daniel Prager wrote:
> >
> > While we're at it, please allow negative arguments too, to allow for cases
> > such as
> >
> > (random -100 100
> On Mar 2, 2017, at 2:06 PM, Jay McCarthy wrote:
>
> I think that the contract is overly specific on the 2 argument case.
> But on the 1 argument case, I don't think 0 makes sense:
>
> "When called with an integer argument k, returns a random exact
> integer in the range 0 to k-1."[k <- 0]
> =
> On Mar 2, 2017, at 3:00 PM, Daniel Prager wrote:
>
> While we're at it, please allow negative arguments too, to allow for cases
> such as
>
> (random -100 100)
Well, that’s different; that’s actually changing the implementation. I’m not
proposing that…
John
--
You received this messag
I have a bunch of students this quarter that are writing code like this:
(- (random 1 9) 1)
Why? because they tried writing
(random 0 8)
and got a contract error, to wit:
random: contract violation
expected: (integer-in 1 4294967087)
given: 0
>
I’m assuming that this contract was writt
did a quick grep for ‘ffi’ and ‘unsafe’, and in fact I don’t
think the package has any weirdness in it at all.
John
>
> At Fri, 24 Feb 2017 19:52:43 -0500, "'John Clements' via Racket Users" wrote:
>> I’m currently in a state where calling `make` in my top-
I’m currently in a state where calling `make` in my top-level racket directory
results in output ending thusly:
…
raco setup: 1 making: /cldr-bcp47/cldr/bcp47/data
Assertion failed: (!(used && (pre_body->count == 1) &&
pre_body->vars[0]->optimize.known_val && ((Scheme_Type)(scheme_once_used_type
> On Feb 21, 2017, at 1:01 PM, Gustavo Massaccesi wrote:
>
> I'm not sure if this changed. To get a #t with equal? you can add
> #:transparent . But be careful because #:transparent is more powerful
> than what I expected. For example, it makes available the constructor
> of the struct.
I’m sor
perform structural traversal.
I agree; my only point is that those writing unit tests probably want to define
(or have defined) two separate notions of equality; one for use in tests, and
one for use by clients. And that testing frameworks should
accommodate/encourage this.
John
>
>
> On Feb 20, 2017, at 11:02, Matthias Felleisen wrote:
>
>
>> On Feb 20, 2017, at 1:53 PM, John Clements wrote:
>>
>> No, I don’t think you missed anything, but from the standpoint of those
>> teaching early classes in either Java or Python (a standpoint that I
>> understand you are general
> On Feb 19, 2017, at 14:40, Matthias Felleisen wrote:
>
>
>> On Feb 18, 2017, at 11:12 PM, 'John Clements' via Racket Users
>> wrote:
>>
>> (cc:ak)
>>
>> Okay, this sounds just crushingly obvious now that I say it, but honestly, I
(cc:ak)
Okay, this sounds just crushingly obvious now that I say it, but honestly, I
don’t think it’s occurred to me:
One reason that equality is such a nightmare in Java and Python (which turns
out to be JUST AS BAD), is that those of us that actually want to write unit
test cases want *inte
Here’s a simple program that fails:
#lang typed/racket
(define (obscurinator [x : Any]) : Any
x)
(struct PrimV ([f : (Real Real -> Real)]) #:transparent)
(define dangerval : PrimV
(cast (obscurinator (PrimV +))
PrimV))
((PrimV-f dangerval) 3 4)
It type-checks fine, but it produces
> On Feb 14, 2017, at 9:00 AM, David Storrs wrote:
>
>
>
> On Tue, Feb 14, 2017 at 11:41 AM, 'John Clements' via Racket Users
> wrote:
>
> > On Feb 14, 2017, at 8:36 AM, David Storrs wrote:
> >
> > I have murphy/protobuf installed and I&
> On Feb 14, 2017, at 8:36 AM, David Storrs wrote:
>
> I have murphy/protobuf installed and I'd like to look at the source code.
> How do I find it?
I think you’re looking for the ‘collection-file-path’ function, if you want to
do it programmatically.
Alternatively, If you just want to open
So I went looking for Matthew’s classic 2011 post on ‘eval’, today, and my
friendly local search engine returned this link:
https://blog.racket-lang.org/2011/10/on-eval-in-dynamic-languages-generally.html
… which is now a 403 Forbidden.
After some searching, I figured out that the correct link
> On Jan 16, 2017, at 00:31, Andreas Olsson wrote:
>
> I've never done serialisation befor. I have to learn that then. :-)
Well, quoting is one form of serialization, so in some sense, you *have*… I
would definitely echo others, though, in suggesting that using ‘eval’ here is a
not-at-all-goo
It looks like there’s a race condition—actually, I think I’m abusing this
term—that occurs when the handin server runs out of memory while
(re-)evaluating a checker module. Specifically, it appears that following such
a failure, subsequent attempts to check this assignment simply enter a stalled
> On Jan 15, 2017, at 09:23, Andreas Olsson wrote:
>
> I have function that demand a quoted lambda as an argument, how would you
> write that in defproc?
I think that—unlike the contract system, or typed racket—you can put pretty
much anything you want in the “type/contract” slot of a defproc
> On Jan 9, 2017, at 1:16 PM, Andreas Olsson wrote:
>
>
> I'm having a little trouble. I have constructed a package with files that
> work when tested in a directory, when installed as a package I get a path
> problem. A function in one file creates places that's loaded with a separate
> fil
> On Dec 29, 2016, at 09:46, Matthew Butterick wrote:
>
>
>> On Dec 23, 2016, at 6:55 AM, Greg Trzeciak wrote:
>>
>> 1. There is one thing that frustrates me most when I stumble upon new
>> website/package/repository for the first time and I have no previous
>> knowledge of its content. It
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