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14:40 Demosthenes: so, what is "#<|->|>", and why would a racket program i can run normally bomb with a contract error citing that when i make an executable with raco?
14:40 Demosthenes: that looks like perl line noise ;]
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14:47 jonrafkind: is that some crazy syntax for writing a symbol?
14:49 Demosthenes: broke the contract contract?; expected <contract?>, given: #<|->|>
14:49 Demosthenes: i don't know what it means, i didn't write that ;]
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14:50 jonrafkind: it looks like -> was supposed to be imported as a macro that expand to 'contract' or something, but it wasn't imported so it just ends up as the symbol ->
14:50 jonrafkind: is this easily reproducible?
14:51 Demosthenes: well, its a large program. i'm not sure why its fried
14:51 Demosthenes: i've not tried an exe version until now
14:51 jonrafkind: ok let me try a simple test
14:51 Demosthenes: if i could distill it down to one thing that makes it bomb... i would ;]
14:52 clklein: In 5.0.2, the expression (-> number? number?) evaluates to something that prints as #<|->|>
14:52 Demosthenes: i just haven't a clue where to start, i have no idea where #<|->|> came from
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14:52 clklein: i.e., a value representing a function contract
14:52 clklein: But I have no idea why it prints that way.
14:53 Demosthenes: ah. ok. well, i didn't write any contracts of my own
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15:04 mye: I'm learning macros. Is this http://codepad.org/QUvvpvpB a good / conventional way to write a macro that dispatches based on type?
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15:05 jonrafkind: i suppose thats reasonable
15:05 jonrafkind: theres a better system for doing such things these days, syntax-parse
15:06 jonrafkind: http://docs.racket-lang.org/syntax/Parsing_syntax.html?q=syntax-parse#(form._((lib._syntax/parse..rkt)._syntax-parse))
15:06 mye: jonrafkind: i saw this but had no clue what it's supposed to do. I'll take a look.
15:15 jonrafkind: ugh, i need to make an account to post something on codepad
15:16 jonrafkind: mye, http://www.cs.utah.edu/~rafkind/tmp/x
15:16 jonrafkind: there is no built-in class for symbol but you can make one easily
15:16 jonrafkind: anyway the point is you do pattern-variable:class, where the : separates the two things
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15:21 Demosthenes: here's that funny error: http://pastebin.com/iUZr1ZZA
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15:27 mye: jonrafkind: thanks for the code. So, is syntax-parse where it stops? Is research still ongoing on how to actually do macros? Do they complement each other?
15:28 jonrafkind: syntax-parse is just for parsing the s-expression, the rest of the macro system (building the result) isn't affected much by syntax-parse
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17:25 samth: Demosthenes, the problem you're having with contracts is that you're using the `->' contract constructor as a contract itself
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17:36 mye: Regarding indendation, I use the "reindent all" shortcut in DrRacket, so it seems I can't produce code like the first here: http://codepad.org/rJXpTwmG   ?!
17:37 mye: or is there a setting somewhere?
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17:44 Demosthenes: samth: i didn't use contracts...
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17:47 samth: so, it looks like the `syntax/parse' library broke the contract
17:47 Demosthenes: so, it runs fine when i launch it, it fails when i compiled it to executable
17:48 samth: mye, add `syntax-parse' as a "lambda-like keyword" in the preferences dialog under editing
17:48 samth: Demosthenes, i expect that's a bug in the syntax/parse library
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21:01 em: is it possible to use Racket with Apache or should I try to just figure out how to use Racket's webserver? And if Apache is already listening to port 80, will that interfer with racket or vice versa?
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22:37 offby1: em: I assume you can rig up apache to forward requests to racket, and perhaps vice-versa
22:38 offby1: you can tell both apache and racket the port on which you want them to listen, so there's no reason for them to squabble