Re: [racket-users] Beautiful Racket v1.0

[Daniel Prager]

Bravo Matthew!

Great stuff.

I look forward to buying it and using the payment to help motivate me to
work through *all* the goodness.


Cheers

Dan

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Re: [racket-users] reference before definition vs unbound

[Jay McCarthy]

I'm reasonably sure the answer is that the first is a runtime error
and the second is not. I think the runtime error gets a name from
syntax-local-infer-name, but perhaps it could/should also save the
srcloc for the message.

On Wed, Mar 15, 2017 at 5:48 PM, Dan Liebgold
 wrote:
> Hi -
>
> Is there are a reason the error for referring to an identifier before it's 
> definition doesn't get location info, whereas in an otherwise identical case 
> the unbound identifier error does?
>
> e.g.:
>
>   asdf: undefined;
>cannot reference an identifier before its definition
> in module: (submod "file.rkt" test)
>
> vs
>
>   file.rkt:87:16: asdf: unbound identifier in module
> in: asdf
>
>
> Thanks,
> Dan
>
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-- 
-=[ Jay McCarthy   http://jeapostrophe.github.io]=-
-=[ Associate ProfessorPLT @ CS @ UMass Lowell ]=-
-=[ Moses 1:33: And worlds without number have I created; ]=-

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[racket-users] reference before definition vs unbound

[Dan Liebgold]

Hi -

Is there are a reason the error for referring to an identifier before it's 
definition doesn't get location info, whereas in an otherwise identical case 
the unbound identifier error does?

e.g.:

  asdf: undefined;
   cannot reference an identifier before its definition
in module: (submod "file.rkt" test)

vs

  file.rkt:87:16: asdf: unbound identifier in module
in: asdf


Thanks,
Dan

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Re: [racket-users] Re: syntax expands to define syntax, problems with ...

[Dan Liebgold]

On Wednesday, March 15, 2017 at 9:36:19 AM UTC-7, Sam Tobin-Hochstadt wrote:
> You need to escape the ... with another ..., like this:
> 

That's what I forgot.  Is there any other case where things are escaped in this 
manner?  It's a little surprising...

Thanks,
Dan

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Re: [racket-users] Re: syntax expands to define syntax, problems with ...

[Stephen Chang]

The inner ellipses need to be "escaped". I like using the dot notation
in nested macros but I know others do not like that style.

(define-syntax (test stx)
  (syntax-case stx ()
((_ n e ...)

 #'(define-syntax (n stx)
 (syntax-case stx ()
   ((_ e0 (... ...))
#'(n (e ...) e0 (... ...))
))

On Wed, Mar 15, 2017 at 12:33 PM, Dan Liebgold
 wrote:
> Here's what works, not using the inner ellipses:
>
> http://pasterack.org/pastes/34338
>
> But I'd prefer to use the ellipses..
>
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[racket-users] Re: syntax expands to define syntax, problems with ...

[Dan Liebgold]

Here's what works, not using the inner ellipses:

http://pasterack.org/pastes/34338

But I'd prefer to use the ellipses..

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[racket-users] Re: syntax expands to define syntax, problems with ...

[Dan Liebgold]

Oops, try this link instead (that one had simple mistakes):

http://pasterack.org/pastes/68032

On Wednesday, March 15, 2017 at 9:22:24 AM UTC-7, Dan Liebgold wrote:
> I feel like I'm forgetting something basic, but how can I have a syntax 
> transformer expand to a define-syntax, both using ellipses?
> 
> http://pasterack.org/pastes/27441
> 
> pasterack doesn't seem to return the error, which is
> 
>   syntax: no pattern variables before ellipsis in template in: ...
> 
> at the second "...".
> 
> Thanks,
> Dan

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[racket-users] Re: linking with raco ctool : unable to find libracket3mxxxxxxx.lib

[Carlos Lopez]

Thanks for the clarification.


On Tuesday, March 14, 2017 at 11:30:57 AM UTC-4, Alexander McLin wrote:
> You need to compile Racket from source to generate the .lib file, it is not 
> distributed with the installation.
> 
> You need to make sure the source is the same version as your installed Racket 
> and it is compiled targeting the same bit architecture as the installed 
> Racket version. Then copy the generated .lib file to the Racket 
> installation's lib directory. The directory's location depends on your 
> operating system.

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[racket-users] syntax expands to define syntax, problems with ...

[Dan Liebgold]

I feel like I'm forgetting something basic, but how can I have a syntax 
transformer expand to a define-syntax, both using ellipses?

http://pasterack.org/pastes/27441

pasterack doesn't seem to return the error, which is

  syntax: no pattern variables before ellipsis in template in: ...

at the second "...".

Thanks,
Dan

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Re: [racket-users] Require the same file repeatedly for debugging on command line

[Marc Kaufmann]

Ha, very nice. That's exactly what I was looking for - at least it works if
I drop the "#lang racket" at the beginning of the file. If I do include it
and thus, if I understand correctly, make it a module, it somehow does not
seem to load it properly. Short example for file test.rkt:

#lang racket

(define (blob x) 7)

(provide blob)

In xrepl:
> ,rr test.rkt
; reloading "test.rkt"
> blob
; blob: undefined;
;  cannot reference undefined identifier
; [,bt for context]

What am I missing? It does work if I drop the #lang and the `provide.

Marc

On Wed, Mar 15, 2017 at 10:35 AM, Greg Hendershott <
greghendersh...@gmail.com> wrote:

> Have you tried using XREPL -- perhaps its ,enter command or
> ,require-reloadable?
>
>   https://docs.racket-lang.org/xrepl/index.html
>
> On Mon, Mar 13, 2017 at 9:44 PM, Marc Kaufmann
>  wrote:
> > Hi all,
> >
> > while trying to debug, I often change the code in the text file and then
> want to do a (require "file-with-code.rkt") on the command line to test the
> new code. This never works, because I cannot redefine imported modules.
> Thus I always use Dr Racket for this, where I can hit the "Run" button,
> which reruns everything and all is good. Since I prefer to use Vim for
> editing, I was wondering if there is an equivalent of the "Run" button for
> the command line (well, for the require at least)?
> >
> > Thanks,
> > Marc
> >
> > --
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