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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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
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
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
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
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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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 (... ...))
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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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:
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
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