nc2)
(list (R) (Q)
(displayln "with multiple algebraic states:")
(J) ; 2 -2
(J) ; 2 -2
(J) ; 2 -2
```
On Friday, July 30, 2021 at 11:04:09 AM UTC-4 Matthew Flatt wrote:
> At Sun, 25 Jul 2021 10:35:00 -0700 (PDT), Greg Rosenblatt wrote:
> > I was surprised that subsequent re
Thanks for the response, Jack.
I'm looking at: https://docs.racket-lang.org/reference/contmarks.html
I don't see a way to update the value of an existing key without installing
a new mark. Is it possible to do that? Parameters allow you to update the
value associated with the innermost use
I'm using dynamic binding while also using delimited control operators such
as shift and reset. When shift captures the context of a `parameterize`,
I'd like to be able to resume that continuation in the same context
multiple times without observing modifications caused by other resumptions.
> (name.r ...) (values))` to forward-declare all those names, and then
> the subsequent definitions will work correctly.
>
> Sam
>
> [1] https://lists.racket-lang.org/users/archive/2005-November/010350.html
> is a good short description of the problem here.
>
> On Fri,
I've encountered an identifier binding order issue that only manifests in
the REPL. My current workaround is to use forward definitions followed by
set!s. I've heard rumors that the top-level is hopeless, but I'd like to
try and make this work without unnecessary workarounds, if possible.
n some sense exactly what's requested here, the
> andThen combinator mentioned here is what I think you originally requested:
> http://www.cs.cornell.edu/people/fluet/research/tx-events/
>
> Sam
>
> On Tue, Mar 16, 2021, 9:48 PM Greg Rosenblatt wrote:
>
>> Thank
Sam Tobin-Hochstadt wrote:
> I think Aaron Turon's reagents (and more generally k-cas) are an example
> of N-way rendezvous.
>
> Sam
>
> On Mon, Mar 15, 2021, 5:50 PM Matthew Flatt wrote:
>
>> At Mon, 15 Mar 2021 13:38:46 -0700 (PDT), Greg Rosenblatt wrote:
>>
Some context for my question: `choice-evt` constructs an event that behaves
analogously to a logical disjunction, choosing any of its members that is
ready for synchronization.
Is there a corresponding event for a logical conjunction (I was looking for
something like `all-evt` or `every-evt`),
Great, thanks. Out of curiosity, where in the reader was this bug
originally? Can you point me to a diff?
On Sunday, March 7, 2021 at 8:42:33 PM UTC-5 sorawe...@gmail.com wrote:
> This is already fixed. Racket 8.0 doesn't have this issue.
>
> On Mon, Mar 8, 2021 at 8:31 AM Greg R
Large inexact numbers may change values after a second round trip between
read and write. I was expecting to reach a fixed point after the first
round trip. Is this a bug?
Welcome to Racket v7.8 [cs].
> 4.57030e+53
4.5703e+53
> 4.5703e+53
4.57029995e+53
--
You received this message
What is the best way to create threads that will prevent a program from
exiting until they have completed their work? I'd like to be able to do
this implicitly, without cooperation from the main thread.
My first experiment uses `shift` to insert uses of `thread-wait` after the
rest of the
I'm experimenting with using custodians to manage threads (on Racket 7.8
[cs]) and encountering behavior I don't understand.
I start a looping thread `t1` under a new custodian `c1`.
I then shutdown `c1` and expect `t1` to stop looping. If I started `t1`
with `thread` then this expectation is
.0.7 [cs].
> loading example
> "x.rkt"> example
> 5
> "x.rkt">
> ```
>
> Perhaps there was a problem with 7.3 that you're running into? Can you
> try with the 7.8 release?
>
> Sam
>
> On Sun, Aug 9, 2020 at 8:33 PM Greg Rosenblatt &g
Given a module defined in example.rkt:
```
#lang racket/base
(provide example)
(displayln "loading example")
(define example 5)
```
I used to be able to enter example.rkt with an interactive session from the
shell like this:
> racket -ie '(enter! "example.rkt")'
Welcome to Racket v7.3.
ime, use the
> number of read bytes to increment a starting position into the
> destination byte string (which is the third argument to `read-bytes!`).
>
> Matthew
>
> At Wed, 15 Jul 2020 15:05:22 -0700 (PDT), Greg Rosenblatt wrote:
> > Hi, I'm getting an error whi
Hi, I'm getting an error while using file->bytes to load a moderately large
file:
> (time (void (file->bytes "my-7.6GB-file")))
; error reading from stream port
; port: #
; system error: Invalid argument; errno=22
; context...:
;/Applications/Racket v7.7/collects/racket/file.rkt:768:6:
does: it is like for-syntax, but it shifts
> imports a phase level down instead of a phase level up.
>
> (Note that (for-template (for-syntax )) is a no-op, since the shifts
> cancel each other out. It may be educational to think about the
> implications of this for your
Hi, I'm having trouble writing a syntax transformer that uses a
syntax-generating procedure defined elsewhere.
When the procedure is defined locally, everything is fine.
When the procedure is defined outside the transformer, I have to do a dance
to make the procedure visible at the right
I'm confused by the behavior of pattern matching in some cases. I'll
discuss a few sets of examples involving segment patterns, then a mix of
`and`, `or`, and `not` patterns.
Here is a basic segment pattern matching the entire contents of a list:
> (match '(1 2 3)
((list x ...) `(result:
I'm confused about the behavior of quasiquote and quasisyntax in some cases
(using Racket v6.10.1). I'll list some examples alongside my questions.
This vector quasiquote behavior makes sense to me:
> `#(3 ,@'(4))
'#(3 4)
The analogous quasisyntax gives an error, which seems strange. What's
Hi,
I've been experimenting with various corner cases of the macro system to
better understand the implementation. For comparison, I've also been
running the experiments in Chez Scheme.
I found a difference of opinions when running the following two tests. The
idea is to test under what
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