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02:29 mithos28: is there a way to use raco to compile with errortrace?
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03:50 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/1Tk5nw
03:50 RacketCommitBot: [racket/master] New Racket version 5.2.0.1. - Eli Barzilay
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09:53 Gertm: If I define a struct in one module, add it to the (provide ..) line, what could prevent it from being seen in another module where I (require..)'d the first module?
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10:41 Gertm: found it, had to use (struct-out ..)
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11:03 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/46hFYA
11:03 RacketCommitBot: [racket/master] fix ffi retain of callbacks - Matthew Flatt
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12:12 a3nm: hi
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12:17 _p4bl0: Hi everyone, I have a module which provides a macro which expands to a lambda expression. When I require this first module in a second one, and use this macro, if the expansion of the macro contains references to identifiers defined in the second module, I have an error saying that these identifiers are unbound, and that's a problem for me.
12:17 _p4bl0: It seems as if the code created by the macro expansion lives in the first module instead of where I used the macro.
12:18 jonrafkind: yes, thats hygiene
12:18 _p4bl0: jonrafkind: but the identifiers are not "created" by the macro, they are given to it
12:18 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/KEFs8A
12:18 RacketCommitBot: [racket/master] Change basic-top-level-window% to support `set-icon', and use to set icon for splash screen. - Sam Tobin-Hochstadt
12:18 RacketCommitBot: [racket/master] docs and release notes for `set-icon' change - Matthew Flatt
12:18 jonrafkind: if you want to use identifiers from the first macro there are a number of options, one is to break hygiene and to give the identifiers the lexical context from the 2nd module
12:19 jonrafkind: hygiene says if you have a macro that refers to +, then it will refer to exactly the + that is bound when the macro is created
12:19 _p4bl0: jonrafkind: I know, but here the macro refers to + only because I told it to when I called it.
12:20 jonrafkind: can you give an example
12:20 _p4bl0: okay, I'll try to have a minimal case and come back with it :-)
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12:41 _p4bl0: jonrafkind: http://pastie.org/2666387 here, sorry it's not that small.
12:41 jonrafkind: ok
12:42 _p4bl0: you see, my problem is that the "plus" identifier is given in second.rkt to the macro, so it should be okay, but I guess the level of indirection cause the problem
12:43 jonrafkind: do you want to define name as an identifier macro?
12:43 jonrafkind: or just a regular macro
12:44 jonrafkind: oh you are trying to put that value into name and then get it out later..
12:44 jonrafkind: thats pretty wierd :p
12:44 _p4bl0: :-p
12:44 _p4bl0: yea that's what I'm doing
12:45 jonrafkind: most likely the syntax->datum is screwing things up
12:45 _p4bl0: maybe I could have the define-foo macro attach the lexical context of it argument to the syntax object it creates?
12:45 _p4bl0: ah right
12:45 jonrafkind: you should extract the syntax objects with stx-car or whatever
12:45 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/aSZD9g
12:45 RacketCommitBot: [racket/master] fix QNX sconfig entry - Matthew Flatt
12:45 RacketCommitBot: [racket/master] mark OS jmpbuf as GC-ignored - Matthew Flatt
12:46 jonrafkind: what are you trying to accomplish anyway?
12:47 _p4bl0: I'm doing a tool to make RESTful APIs with the racket web server
12:47 jonrafkind: ok but more low level what are you trying to do with syntax here
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12:50 _p4bl0: I want to be able to define resources and then have a macro which takes those resources as an argument and generate a lambda expression wrapping a big match which does the dispatch given the route and the HTTP method of the request. This lambda expression will be the argument to serve/servelet
12:51 _p4bl0: So I want to generate a single match form given data from difference define-foo macros
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12:51 _p4bl0: that works, except this hygiene problem
12:51 jonrafkind: do you plan on using define-match-expander ?
12:51 _p4bl0: nope
12:51 jonrafkind: do you know of its existence?
12:51 _p4bl0: yes
12:52 _p4bl0: but I don't really get how to use it
12:52 jonrafkind: aha
12:52 _p4bl0: ^^
12:52 jonrafkind: its just a macro that is invoked by match to do whatever you want
12:52 jonrafkind: so you can do (match foo [(my-foo x y z) ...])
12:53 jonrafkind: where my-foo is a macro that checks if foo is a foo? and maybe some other stuff, then pulls out the x/y/z attribuets from x
12:53 jonrafkind: i mean from foo
12:54 _p4bl0: okay, but that won't solve my problem, because my problem is only for the body part of the match clauses
12:54 _p4bl0: but thanks for the tip, I'm pretty sure it can help me clean a bit my current code
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12:57 _p4bl0: w00t, it seems to be working if I use stx-car and stx-cdr
12:58 _p4bl0: "it seems" because I only tried on my minimal example
12:58 _p4bl0: jonrafkind: (btw, I did not came across stx-car and stx-cdr before you mentionned it, thanks a lot)
12:58 jonrafkind: cool
12:59 jonrafkind: you could have also destructured the syntax-local-value with syntax-case or whatever, thats what I would have done
13:03 _p4bl0: yea I just have to, cddddr is kinda okay, but (stx-cdr (stx-cdr (stx-cdr (stx-cdr ... is not. (using with-syntax)
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17:17 zort-: How do you retrieve the "foo" in "'foo"? That is, the symbol "foo" has a value which I want but I don't know how to get it out of the quote.
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18:30 a3nm: zort-: eval ?
18:45 zort-: yay
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20:17 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/hkci5Q
20:17 RacketCommitBot: [racket/master] history for release - Matthias Felleisen
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21:46 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/GGO1AQ
21:46 RacketCommitBot: [racket/master] fix compiler confusion: non-mutating vs reorderable unsafe ops - Matthew Flatt
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