Again, ignore this if it's already been fixed. The docs contain this example:
#lang racket
(provide main)
(define (any-double? l)
(for/or ([i (in-list l)])
(for/or ([i2 (in-list l)])
(= i2 (* 2 i)
(define (main)
(define p
(place ch
(define l (place-channel-get ch
The example in the guide works fine:
#lang racket
(provide main)
(define (any-double? l)
(for/or ([i (in-list l)])
(for/or ([i2 (in-list l)])
(= i2 (* 2 i)
(define (main)
(define p
(place ch
(define l (place-channel-get ch))
(define l-double? (any-double? l)
In case you didn't catch Stephanie Weirich's post of this on plus.google.com,
here's some very interesting information about ArXiv and ACM and where
copyrights intersect.
It may be that you can avoid much of this by only publishing "draft" versions
of your paper on ArXiv; I Am Not A Lawyer.
Jo
On Sep 30, 2011, at 10:07 AM, John Clements wrote:
> In case you didn't catch Stephanie Weirich's post of this on plus.google.com,
> here's some very interesting information about ArXiv and ACM and where
> copyrights intersect.
>
> It may be that you can avoid m
On Sep 30, 2011, at 6:31 AM, Matthew Flatt wrote:
> At Fri, 30 Sep 2011 09:21:42 -0400, Eli Barzilay wrote:
>> A few minutes ago, Kevin Tew wrote:
>>> place-channel-put is not blocking.
>>
>> So "channel" in the name is not a good choice...
>
> We use "channel" for asynchronous channels, too, s
On Sep 30, 2011, at 5:28 AM, Sam Tobin-Hochstadt wrote:
> On Fri, Sep 30, 2011 at 12:26 AM, John Clements
> wrote:
>> I'm guessing that calling place-channel-put with a descriptor pulls out the
>> associated channel... should the docs indicate this?
>
> The do
On Oct 2, 2011, at 1:30 PM, Ryan Culpepper wrote:
> The release process for v5.2 will begin in about a week. If
> you have any new features that you want in and are relatively close
> to being done, now is a good time to do that.
Cool... 5.2!
What's the occasion?
John
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Just saw the autosave recovery feature for the first time; super-nice. It was
immediately followed by an internal error that may or may not be repeatable,
though it looks like a straightforward insertion of "path->string" will solve
it.
John
set-label in control<%>: expected argument of typ
On Oct 3, 2011, at 2:13 PM, Doug Williams wrote:
> There are ways around it like that. For example, I'm trying to get in the
> habit of using ~.s in printf's where it might occur. But, I think it would be
> easy in this case to just fix the real problem.
I don't think I would agree that #:tran
On Oct 3, 2011, at 3:01 PM, Doug Williams wrote:
> The fact that transparent structures also print all of their element - in
> this case recursively, ad nauseam - is more of a side effect. In that case, I
> think prop:custom-write properties should be added. I assume any of the print
> limitin
I conjecture that if a place is blocked on a mzrt_sema semaphore and if that
semaphore is then collected using a call to mzrt_sema_destroy(), then the
waiting thread will simply wait forever. Is that correct?
John
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On Oct 4, 2011, at 1:48 PM, Matthew Flatt wrote:
> At Tue, 4 Oct 2011 13:34:17 -0700, John Clements wrote:
>> I conjecture that if a place is blocked on a mzrt_sema semaphore and if that
>> semaphore is then collected using a call to mzrt_sema_destroy(), then the
>> waiti
I'm using the rsound planet package in beginning student languages, and
requiring them to type
(require (planet "main.rkt" ("clements" "rsound.plt 2 6")))
at the top of every file is a bit painful.
Would it be difficult to support the shorter
(require (planet clements/rsound))
syntax in the
On Oct 5, 2011, at 9:45 AM, Neil Toronto wrote:
> I've just pushed the new 'plot' library.
>
> Eli and I both forgot that the new 'plot' still needs the old libfit, and
> removed it along with libplplot. I just added libfit back (the sources are in
> "src/fit" now instead of "src/plot/fit") al
Currently, opening a file that doesn't begin with a #lang line results in a
window whose language level is inherited from the buffer that was foremost when
the open-file was issued (IIUC). I think this is a mistake. I think that
instead, the language level should revert to "Use the language defi
On Oct 6, 2011, at 11:30 AM, Robby Findler wrote:
> Two hours ago, John Clements wrote:
>>> Currently, opening a file that doesn't begin with a #lang line
>>> results in a window whose language level is inherited from the
>>> buffer that was foremost when the o
On Oct 7, 2011, at 4:27 AM, Robby Findler wrote:
> On Thu, Oct 6, 2011 at 10:37 PM, Stephen Bloch wrote:
>>
>>
>> On Oct 6, 2011, at 4:35 PM, "John Clements"
>> wrote:
>>
>>> If there's any disagreement, it's about what sh
On Oct 7, 2011, at 9:50 AM, Robby Findler wrote:
> I've just now pushed a change for this.
Awesome! Can't wait. Will this be a part of 5.2?
John
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I'm building cross-platform binaries, and one of my platforms is Windows.
Moreover, I'm calling mzrt_sema primitives from my library, but those are the
only Racket functions I'm calling.
I can think of at least three possible approaches to this, and if someone can
give me 30 seconds of advice,
On Oct 8, 2011, at 10:39 AM, Matthew Flatt wrote:
> At Sat, 8 Oct 2011 10:28:58 -0700, John Clements wrote:
>> I'm building cross-platform binaries, and one of my platforms is Windows.
>>
>> Moreover, I'm calling mzrt_sema primitives from my library, but th
On Oct 8, 2011, at 10:43 AM, Matthew Flatt wrote:
> At Sat, 8 Oct 2011 10:41:52 -0700, John Clements wrote:
>>
>> On Oct 8, 2011, at 10:39 AM, Matthew Flatt wrote:
>>
>>> At Sat, 8 Oct 2011 10:28:58 -0700, John Clements wrote:
>>>> I'm building c
On Oct 8, 2011, at 7:47 AM, Robby Findler wrote:
> Okay, here's what I've done for the upcoming release. (It is a kind-of
> patch on the existing setup, but perhaps that's appropriate, since the
> right long-term solution is to move everything to #lang.)
>
> When a file is opened, and the langu
Just to confirm this: it looks like I can't pass cpointers through
place-channels in version 5.1.3.
However, it looks to me like I can cheat, using the standard unsafe C
transformations to turn pointers into numbers and back again, right?[*]
John
[*]The pointer in question is allocated using m
Does typed racket know about ffi/vector, and more specifically s16vectors? I
can't find a typed/ffi/vector, and if I import them as opaque types, typed
racket won't know about the representations of these vectors, and it doesn't
seem reasonable to think that they'd do a good job of optimizing th
It looks like there's a problem with the ffi implementation of (malloc ...
'raw) in Windows. In particular, if I call 'free()' in a C extension on a
block of memory that was allocated with (malloc ... 'raw), I get the Windows
equivalent of a core dump, with an exception code that indicates "hea
On Oct 18, 2011, at 3:36 PM, Matthew Flatt wrote:
> At Tue, 18 Oct 2011 15:27:28 -0700, John Clements wrote:
>> It looks like there's a problem with the ffi implementation of (malloc ...
>> 'raw) in Windows. In particular, if I call 'free()' in a C extensio
directory, you can do this:
> cd ...racket-root...
> git archive --remote=git://git.racket-lang.org/plt.git release \
> -- collects/tests | tar x
>
> --
>
> * John Clements
> - Stepper Tests
>
I'm getting occasional (non-reliably-reproducible) seg faults when calling a C
routine that copies bits from one place to another.
My working assumption is that the buffer is getting moved by GC in between the
computation of the pointers and the actual ffi invocation, though that's a
fairly tig
On Oct 21, 2011, at 2:30 PM, Matthew Flatt wrote:
>
> In case it helps, I'm thining of adding something like the following to
> the docs:
>
>
> For the following scenarios, assume
>
> * A `define-mylib' form of the sort that `ffi/unsafe/define' would
> produce.
>
> * A C function f() that
On Oct 27, 2011, at 4:51 PM, ro...@racket-lang.org wrote:
> robby has updated `master' from 91866f58c7 to dc24fbf62d.
> http://git.racket-lang.org/plt/91866f58c7..dc24fbf62d
Those were open-source?
MOST, MOST, AWESOME>>
John
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Good thing I encountered a bug at "0:00". Happy Birthday!
John
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http://lists.racket-lang.org/listinfo/dev
It looks to me like my drracket REPL is unusable. To wit:
1) unset PLTCOLLECTS.
2) move ~/Library/Racket
3) move ~/Library/Preferences/*racket*
4) start drracket
5) Choose "Use Language Declared in Source"
6) Run
7) In REPL, evaluate 13
... get this error message:
compile: unbound identifier (an
On Dec 20, 2011, at 8:08 AM, Sam Tobin-Hochstadt wrote:
> On Tue, Dec 20, 2011 at 8:02 AM, Matthias Felleisen
> wrote:
>>
>> I do NOT like pages that have text below my laptop screen 'fold'.
>> My eyes do glaze over. And I am off the page quickly.
>
> The important questions about this are:
>
anch updated
>
> clements has updated `master' from 276cb4150d to 481bc2f00f.
> http://git.racket-lang.org/plt/276cb4150d..481bc2f00f
>
> =[ 2 Commits ]==
>
> Directory summary:
> 100.0% collects/stepper/private/
>
&
On Jan 17, 2012, at 3:44 PM, Ryan Culpepper wrote:
> Checklist items for the v5.2.1 release
> (using the v5.2.0.900 release candidate build)
>
> Search for your name to find relevant items, reply when you finish an
> item (please indicate which item/s is/are done). Also, if you have any
> comm
directory, you can do this:
> cd ...racket-root...
> git archive --remote=git://git.racket-lang.org/plt.git release \
> -- collects/tests | tar x
>
> --
>
> * Matthew Flatt
> - mzc --exe tests
&
On Jan 20, 2012, at 12:18 PM, Ryan Culpepper wrote:
> Checklist items for the v5.2.1 release
> (using the v5.2.0.900 release candidate build)
>
> * John Clements
> - Stepper Updates: update HISTORY
> (updates should show v5.2.1 as the most current version; email me
>
e procedure. Let me know if I should/shouldn't
push the commit below:
John
oiseau:~/plt/collects/scribblings/slideshow clements$ git show 72edb8c
commit 72edb8c861ecb5ccfb90ade8d83ae86a6289bc13
Author: John Clements
Date: Sat Jan 28 15:11:18 2012 -0500
added docs for a&d args of
On Feb 3, 2012, at 10:32 AM, Matthias Felleisen wrote:
>
> I would think that browser-like buttons are enough, and match the stack
> philosophy.
>
> I also think that stacks are fine. If working with bookmarks suggest we want
> something else, we should explore this as a second step.
I agr
A user on stackoverflow had a question about this code:
(define list-sum-odd
(lambda (list)
(cond
((null? list) 0)
((odd? (car list)) (+ (car list) (list-sum-odd (cdr list
(list-sum-odd (cdr list)
(list-sum-odd '(3 4 5))
... which signalled an error. In #lang rac
On Feb 10, 2012, at 2:43 PM, Danny Yoo wrote:
>>
>> "Ho Ho!" thought I. "Beginner Student Racket will give a much better error
>> message." Actually, though, the error message was much worse: it highlighted
>> the id "list-sum-odd" in what should have been the 'else' case, and wrote:
>>
>> "l
On Feb 11, 2012, at 11:59 AM, Sam Tobin-Hochstadt wrote:
> On Sat, Feb 11, 2012 at 1:27 PM, John Clements
> wrote:
>>
>> Also, in case it's not obvious, a rotated and flipped version of the logo
>> does recall the lambda pretty clearly:
>>
>
> A
On Feb 12, 2012, at 9:37 AM, David Van Horn wrote:
> On 2/11/12 3:04 PM, Asumu Takikawa wrote:
>> On 2012-02-11 13:23:46 -0500, Matthias Felleisen wrote:
>>> Have you guys considered a small change that makes the 'r' more
>>> lambda-ish?
>>
>> Maybe an 'r' in different scripts can be considered?
After axing and re-creating the src directory, I get this error while building
racket on 64-bit Lion:
a - src/rational.o
a - src/read.o
a - src/regexp.o
a - src/resolve.o
a - src/salloc.o
a - src/sema.o
a - src/setjmpup.o
a - src/sfs.o
a - src/string.o
a - src/struct.o
a - src/symbol.o
a - src/sy
On Feb 13, 2012, at 5:15 AM, Matthias Felleisen wrote:
>
> Go do it. Both Asumu and John have sent similar signals. Take the initiative.
> Do!
I sent an e-mail to Asumu about a week ago that sneakily tried to get him to
take responsibility, and it sounds like he might be on it. If not, I'll
I was trying to investigate the expansion behavior of a piece of code for which
I just submitted a bug, and used the macro stepper. I was confused by what I
saw. Here's the program:
#lang racket
(define (takes-kwd-arg #:kwd-arg opt)
(not opt))
(let ([named-val (takes-kwd-arg #:kwd-arg #t)])
On Feb 15, 2012, at 10:24 AM, Michael W wrote:
> I'm no graphics designer but I've been playing with Eli's logo a
> bit. I went gradient-happy; sorry.
>
> Here it is with a silvery sheen:
> http://dl.dropbox.com/u/219506/racket-logo/whitesilver-subtle.png
>
> Less subtle, darker silver:
> http:
On Feb 15, 2012, at 5:33 AM, David Van Horn wrote:
> On 2/15/12 8:27 AM, Matthias Felleisen wrote:
>>
>> On Feb 14, 2012, at 10:26 PM, Asumu Takikawa wrote:
>>
>>> On 2012-02-14 09:58:12 -0800, John Clements wrote:
>>>> I sent an e-mail to Asumu about
In a move that I find not even slightly surprising, the new Apple operating
system (10.8, out soon?) includes new features that make it harder for
developers to deploy their code on user machines.
http://tidbits.com/article/12795
Specifically, the technology is called "Gatekeeper", and it allo
On Feb 21, 2012, at 1:44 PM, Stephen Bloch wrote:
> The latest student query on "users@racket-lang" comes from a student who
> typed an expression at the prompt and hit "Step" to single-step its
> evaluation. Which is a reasonable thing to do, and one I've wished for years
> were possible. H
On Feb 21, 2012, at 7:54 PM, Eli Barzilay wrote:
> A few minutes ago, Sam Tobin-Hochstadt wrote:
>> On Tue, Feb 21, 2012 at 10:22 PM, Eli Barzilay wrote:
>>>
>>> Also, it's likely that I don't understand, but it sounds to me
>>> like it's better to stay out of this thing since otherwise you
>>>
On Feb 13, 2012, at 5:16 PM, Matthew Flatt wrote:
> Have you changed anything about your installation via MacPorts lately?
>
> I think you're seeing a mismatch between a MacPorts iconv and the
> pre-installed iconv. See also
>
> https://lists.racket-lang.org/dev/archive/2011-April/006153.html
On Feb 22, 2012, at 1:05 PM, Norman Gray wrote:
>
> Greetings.
>
> On 2012 Feb 22, at 20:03, Jens Axel Søgaard wrote:
>
>> The tech press reports that the default is to "medium" i.e. applications
>> downloaded from the mac app store and from identified developers (that is
>> signed application
My students are working on an assignment that has them CPS and defunctionalize
a small evaluator so that they can ship computations from one compute server to
another:
http://www.brinckerhoff.org/clements/csc430-wi12/Assignments/ass7.html
As part of this assignment, some of the students are wri
On Mar 9, 2012, at 12:18 PM, Jay McCarthy wrote:
> There is nothing going wrong with the supported features of the Web
> server. It's just that the Web server doesn't support any
> Transfer-Encoding other than the default of no encoding.
From RFC2616:
"A server which receives an entity-body wit
semble
chunked data when it comes back as a response, so this may be as simple as
making the right call in the right place.
John
>
> Jay
>
> On Fri, Mar 9, 2012 at 2:18 PM, John Clements
> wrote:
>>
>> On Mar 9, 2012, at 12:18 PM, Jay McCarthy wrote:
>>
&g
his likely the same error?
In this case, the process itself shouldn't be using more than 100MB or so of
live data, but perhaps it just never collects and constantly increases the
virtual memory address space?
Forgive my ignorance,
John Clements
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The style guide has this to say about blank lines:
"5.8 Spaces
Don’t pollute your code with spaces at the end of lines and extraneous blank
lines."
This comes out pretty strongly against "extraneous" blank lines. In writing the
code below, though, it seems to me that the blank lines aid readab
es: ~e"
> teachpack-requires)))
>
> (define (flagged-requires stx teachpack-requires)
> (for/list ([tp-rq (in-list teachpack-requires)])
>(stepper-syntax-property stx 'stepper-ignore-completely #t)))
>
>
>
>
> On Mar 13, 2012, at 2:16 AM, Joh
On Mar 13, 2012, at 11:10 AM, Matthias Felleisen wrote:
>
>
> Okay. I am adding
>
> Don't pollute your code with spaces at the end of lines.
>
> If you find yourself breaking long blocks of code with blank lines to aid
> readability, consider refactoring your program to introduce auxiliary
ectory summary:
> 98.0% collects/lang/
>
> ~~
>
> 8d6e9e7 John Clements 2012-03-13 12:09
> :
> | cleanup and refactoring of run-teaching-program, minor teachpack stepper fix
One other note/question: in order to make the code read nicely, I imported
split-at and seque
The documentation for in-directory reads:
"Return a sequence that produces all of the paths for files, directories, and
links with dir. If dir is not #f, then every produced path starts with dir as
its prefix. If dir is #f, then paths in and relative to the current directory
are produced."
Was
On Mar 16, 2012, at 3:56 PM, Sam Tobin-Hochstadt wrote:
> * The bug notification-turned-mailing-list interaction aspect of Gnats
>is mostly lost. GitHub sends out notifications when a bug is
>created, but it will *not* send out further comments unless you're
>participating in the di
- I think that it
> is a good thing overall, including not needed a czar. I just want the
> implications to be clear ahead of time.
Okay, many thanks; this makes sense.
John
>
>
>
> On Friday, March 16, 2012, Sam Tobin-Hochstadt wrote:
> > On Fri, Mar 16, 2012 at 7
It looks like 'path-string?' is not labeled as a discriminator type.
> path-string?
- : (Any -> Boolean)
#
>
Is this just an oversight?
John
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On Mar 21, 2012, at 3:20 PM, Sam Tobin-Hochstadt wrote:
> On Wed, Mar 21, 2012 at 5:36 PM, John Clements
> wrote:
>> It looks like 'path-string?' is not labeled as a discriminator type.
>>
>>> path-string?
>> - : (Any -> Boolean)
>> #
>
DrRacket just seg-faulted while trying to open a file after my choice in the
dialog box. The stack trace blames an ffi call … objc_send ? Anyhow, JFYI.
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On Apr 18, 2012, at 8:00 AM, Ryan Culpepper wrote:
> Checklist items for the v5.3 release
> (using the v5.2.901.1 release candidate build)
I'm confused by the OS X download options on the pre-release download page
(http://pre.racket-lang.org/release/installers/).
Specifically, one of the entr
On Apr 18, 2012, at 8:00 AM, Ryan Culpepper wrote:
> * John Clements
> - Stepper Tests
> Updates:
> - Stepper Updates: update HISTORY
> (updates should show v5.3 as the most current version; email me
> to pick the changes when they're done, or tell me if there
I recently completed a full build from source in 15-20 minutes; I think that's
about *half* of what it used to take. Many thanks!
John
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I see that rackunit's check-= handles real numbers only, since it uses "abs" on
the difference between the two. I want to use it on complex numbers, and it
would seem that changing 'abs' into 'magnitude' would not change the
non-error-signalling behavior, and would allow its use on complex numbe
I'm seeing an inconsistency in the behavior of submodules that looks like a bug
in DrRacket (as opposed to Racket).
First, though, it looks like running a module in DrRacket runs *both* the main
and test submodules, if they both exist. I don't think this behavior is
documented; I see this text:
The docs for make-argb read:
Constructs a new argb value. The vector has four entries for each pixel, an
alpha, red, green, and blue value. The int specifies the width of the image;
the height is the size of the vector, divided by 4, divided by the width.
This documentation doesn't specify whet
On Sep 10, 2011, at 6:33 PM, Will M. Farr wrote:
> Thanks, Matthew! It seems to build OK now.
>
I missed the implication of this, the first time around.
If I'm reading this correctly, it means that clang can compile racket, which is
awfully close to being able to run Racket using an LLVM m
On May 9, 2012, at 2:47 PM, Michael W wrote:
> That's an interesting thought.
>
> Racket currently uses GNU Lightning as its JIT, correct? What if
> it used LLVM instead?
> http://en.wikipedia.org/wiki/LLVM#Description
>
> Of course this is much more work than just getting racket to
> build wit
Apologies in advance if this is a known or fixed issue.
Running
raco setup tests
gives the following error message:
raco setup: given collection path: "tests" is not in canonical form (e.g.,
wrong case on a case-insensitive filesystem)
=== context ===
/Users/clements/plt/collects/setup/set
For what it's worth, I still have the info for our "Apple Developer ID" (it's
'plt'), and the password. Anyone want this info in order to sign forthcoming
releases?
John
Begin forwarded message:
> From: Apple Developer
> Subject: Introducing Developer ID and Gatekeeper.
> Date: April 30, 201
I'm trying to build WeScheme locally, and wrestling with Eclipse. Specifically,
I've completed all of the steps given in the README, and I'm now trying to
figure out how to deploy it. It appears to me that I'll need to use Eclipse,
in order to make use of the GWT resources that we installed as
It looks to me like the "free-var-list" is optional in uses of with-contract
and define/contract. The documentation, though, suggests that this is not the
case. Specifically, free-var-list is defined as:
free-var-list = #:freevars ([id co
On Jun 20, 2012, at 9:10 AM, Eli Barzilay wrote:
> Just now, Jon Rafkind wrote:
>> This push resulted in the following failure (drdr will tell you the
>> same thing in a few minutes probably).
>>
>> raco setup: error: during making for stepper/private
>> raco setup: expand: unbound identifier
Reality check before I do something dumb and re-invent the wheel:
I often want to write a for loop where the first element is treated specially.
In such cases, it would be nice to have a sequence that had a #t and then an
infinite number of #f's, so I could write
(for ([s my-sequence] [first? ]
On Jun 21, 2012, at 1:24 AM, Eli Barzilay wrote:
> An hour and a half ago, John Clements wrote:
>
>
>> Yes, of course I can do it the ugly way:
>> [...]
>> (define p1 (mcons #f 'bogus))
>> (set-mcdr! p1 p1)
>> (define true-then-falses (mcons #t p1))
> (for/list ([b (in-list (nested-flow-blocks i))]
> [pos (in-naturals)])
>(render-block b part ri (and starting-item? (zero? pos)
>
> Robby
>
> On Thu, Jun 21, 2012 at 3:24 AM, Eli Barzilay wrote:
>> An hour and a half ago, John Clements
really--radiate from this
point, or would I need to go to the binding identifier and figure out how many
uses the thing has?
John
>
>
> On Jun 20, 2012, at 10:48 PM, John Clements wrote:
>
>> When I'm using online check syntax, I often look at the lines leaving an
>
On Jun 25, 2012, at 4:34 PM, Matthias Felleisen wrote:
>
> The largest part of my commit today concerns a re-organization of
> the documentation for lang/htdp* functions. In the past we lived with
> lists of strings that were eventually turned into a quasi-defproc.
>
> I have scribblized the
On Jun 21, 2012, at 10:09 AM, Robby Findler wrote:
> I'll try to do something along these lines. It shouldn't be hard to
> make it a tooltip.
Don't spend too much time on it!
John
>
> Robby
>
> On Thu, Jun 21, 2012 at 11:03 AM, John Clements
> wrote
Right now, the stepper and the ordinary interactions window disagree in one
minor detail (well, one that I know about…): In the stepper, test cases (e.g.
(check-expect (+ 3 4) 7)) reduce to a boolean, and leave a printed boolean
value in the list of results. In the interactions window, though, n
On Jul 25, 2012, at 4:28 PM, Ryan Culpepper wrote:
>
> * John Clements
> - Stepper Tests
Done.
> Updates:
> - Stepper Updates: update HISTORY
> (updates should show v5.3 as the most current version; email me
> to pick the changes when they're done, or te
On Jul 26, 2012, at 8:09 PM, Robby Findler wrote:
> How about "Misc. minor bug fixes" or something like that instead?
Sure… done.
John
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On Jul 30, 2012, at 5:42 PM, Jay McCarthy wrote:
> DrDr now has green buttons to go between times the file's output has
> changed. Hopefully this will help you find problematic commits easier.
Here's what I think is a super-minor request. When I view the diff of two DrDr
outputs; say:
http://d
On Jul 31, 2012, at 3:57 PM, Jay McCarthy wrote:
> Done :)
Thanks!
John
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I see that you've added a tooltip on check-syntax hover that shows how many
uses a variable has. Thanks!
John
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s. It may well be that you're actually interested in student
language programs, which would be good in the sense that the stepper's
annotation is more robust for these programs, and a bit of extra work in the
sense that I'd have to doctor the annotation to take this into account
Currently, using the (in-directory …) sequence in a directory where there are
unreadable directories causes a funny internal contract failure.
Suppose I have directory "/tmp/f", containing directory "sekrit" which I cannot
read. Then this program:
#lang racket
(sequence->list (in-directory "/t
On Aug 31, 2012, at 3:07 PM, mfl...@racket-lang.org wrote:
> mflatt has updated `master' from eed93825ab to 7b2e18afc5.
> http://git.racket-lang.org/plt/eed93825ab..7b2e18afc5
>
> =[ 2 Commits ]==
> Directory summary:
> 11.6% collects/rac
I was trying to write a function on natural numbers today, and came up with an
example that scares me all to bits. This program:
#lang typed/racket
(: int->nat (Natural -> Natural))
(define (int->nat n)
(cond [(<= n 0) 13]
[else (- n 1)]))
Does not type-check, because (- n 1) has type
On Sep 12, 2012, at 1:03 PM, Jay McCarthy wrote:
> On Wed, Sep 12, 2012 at 8:31 AM, Neil Toronto wrote:
>> Compatibility with C code? Why not have the FFI convert them?
>>
>> Save space? I can see that. It won't help much if they're sent to math
>> library functions, though. Those will convert
On Sep 14, 2012, at 1:14 PM, Robby Findler wrote:
> My $0.02: I find #:while and #:when to be too close, and #:until and
> #:unless even closer.
More bike-shedding: I agree. In response to eli: I find the difficulty of
reading "break-when" to be an adequate cost to pay to highlight the differen
I used the optimization coach for the first time today. First, a suggestion. I
wrestled with it for about five minutes before I realized that it applied only
to programs written in TR. An error message here would be *really* useful; I
kept mousing over and clicking and unclicking things to get t
On Sep 14, 2012, at 4:50 PM, Vincent St-Amour wrote:
> At Fri, 14 Sep 2012 15:39:22 -0700,
> John Clements wrote:
>> I used the optimization coach for the first time today. First, a
>> suggestion. I wrestled with it for about five minutes before I realized
>> that it
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