06:30 <winny> hmm looks like 7.6 ./configure does not quite work, anybody have some tips on making it work?

06:30 <winny> in particular it's not doing a unix-style install for some reason

07:03 <winny> aha! looks like a --enable-useprefix is needed to enable behavior expected by package managers

07:06 <happy_gnu> winny: interesting

07:16 <winny> https://github.com/racket/racket/issues/3046 hope it gets discussed

11:31 <MustardCheese> I can't seem to find any reference to recursive macros anywhere. Are they possible?

12:00 <erkin> MustardCheese: Recursive macros are not only possible but sometimes necessary.

12:00 <MustardCheese> What a relief

12:01 <erkin> I assume you're talking about `syntax-rules' and its successors.

12:01 <MustardCheese> Can you recurse while using syntax-case or must you use syntax-rules ?

12:01 <erkin> `syntax-case' is a superset of `syntax-rules', so yes.

12:02 <erkin> Consider an implementation of `or'. The first two rules are ((or) #t) and ((or var) var), obviously enough. The most important rule would be ((or var rest ...) (if var var (or rest ...))).

12:03 <erkin> So if you have (or foo bar baz), it first expands to (if foo foo (or bar baz)), then (if foo foo (if bar bar (or baz))), then (if foo foo (if bar bar baz)).

12:06 <MustardCheese> Gotcha

12:06 <erkin> You can pretty much make most recursive idioms in Scheme work with macros, including writing helper macros.

12:08 <erkin> For instance, consider a macro that takes some values, reverses them and returns them as values. You can use the "helper procedure with an accumulator" idiom. `reverse-values' would be ((reverse-values arg ...) (reverse-values-aux (arg ...) ())) and `reverse-values-aux' would be ((reverse-values-aux () (acc ...)) (values acc ...)) and ((reverse-values-aux (arg arg* ...) (acc ...)) (reverse-values-aux (arg* ...) (arg acc ...))).

12:11 <erkin> Okay, that's a bit messy to explain in an IRC message.

12:13 <erkin> By the way, I recommend using `syntax-rules' over other macro systems if possible and falling back to the other systems if it falls short (ie you need to break hygiene).

12:13 <erkin> A `syntax-rules' macro can be trivially ported to `syntax-case'/`syntax-parse' if needed.

12:14 <MustardCheese> Right. I'll port this syntax-case macro over to syntax-rules, then

12:19 <MustardCheese> It seems as though this syntax-rules macro cares not for my `begin-for-syntax` definitions earlier in the file

12:19 <erkin> Can you post the code?

12:22 <erkin> Racket implements `syntax-rules' in terms of `syntax-case' so using one or the other shouldn't affect anything outside.

12:23 <MustardCheese> It's a bit of a mess at the moment but I'll try and post all the relevant bits

12:24 <MustardCheese> http://pasterack.org/pastes/56189

12:26 <erkin> It's the `with-syntax' part. You can't do procedural code in `syntax-rules'.

12:27 <erkin> So yeah, this is one of the cases where `syntax-rules' falls short.

12:29 <erkin> Also you don't need to roll your own syntax logger. `syntax-parse' can do that.

12:30 <erkin> https://docs.racket-lang.org/syntax/Source_Locations.html

12:30 <erkin> Related: https://docs.racket-lang.org/reference/exns.html

12:30 <erkin> Err

12:30 <erkin> https://docs.racket-lang.org/reference/exns.html?q=srcloc#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._srcloc%29%29

12:30 <rudybot> https://teensy.info/9EiUOuwuw2

13:08 <MustardCheese> So I can presumably use one of these source location tools to convert syntax into a source location struct

16:54 <dbenoit> how often are the package index scribble docs regenerated?

17:46 <emacsen> hey all. I have some questions about Racket on Windows. Namely what configuration would I need to tell Racket to use mingw-w64 for compiling Racket libraries that need C modules?

21:03 <greghendershott> emacsen: I don't know but some months ago I tried both Linux Racket in WSL, and, running Windows Racket from Linux programs in WSL, and ISTR both worked fine.

21:04 <greghendershott> magit on emacs on Windows makes me sad b/c git is slow on Windows b/c launching program on Win is slow

21:05 <greghendershott> So I was experimenting with running Linux Emacs (and magit and git) in WSL, but actually running Racket for Windows as well as Racket for Linux

21:23 <emacsen> greghendershott, I'm not actually talking about running applications, but rather using libraries that need C libraries built, and I need to do it without any Linux emulation

21:24 <emacsen> That is without WSL or VM or any of that

21:32 <greghendershott> I guess I confused mingw-64 with msys2

21:33 <greghendershott> If you're building Racket yourself, it looks like there's an option to use MinGW instead of MS: https://github.com/racket/racket/blob/master/build.md#13-quick-instructions-in-place-build

21:34 <greghendershott> Do you mean you wan to use mingw-w64 instead of MinGW?? I don't know if that's supported.

21:35 <greghendershott> emacsen: ^

21:36 <greghendershott> People who would know much better than me :) are more likely to be on the Racket mailing list or Slack, than IRC, unfortunately