00:00:47 <aavogt> ah, ghci debugger is pretty helpful
00:01:43 <stepcut> ah.. I have never used it :)
00:02:35 <aavogt> well it turns out the values I stick into that IntMap are somehow undefined....
00:12:53 <sm> aha
00:13:38 <aavogt> I suspect it has something to do with some weirdness in the typeable instance
00:14:06 <aavogt> the data is fine before I apply toDyn
00:14:17 <aavogt> afterwards, it isn't....
00:17:58 <aavogt> puzzling how the compiler accepts my    toDyn (Nothing :: Maybe a)
00:18:20 <aavogt> or at least that is a type that's inside some larger structure
00:18:51 <aavogt> I guess using all these extensions may finally have caught up with me
17:07:52 <aavogt1> hmm, so it turns out that hlist's typeable instances are strict
17:08:21 <aavogt1> so    typeOf (error "is strict" :: HCons Int HNil)  == error "is strict"
17:11:11 <stepcut> aavogt: ah
17:17:07 <aavogt> stepcut: but in my case it's more subtle... the typeable instance is also undefined for any lists of hlists
17:17:25 <stepcut> ah
17:18:46 <aavogt> so now how to put my lists of hlists into Dynamic....
17:19:14 <aavogt> oh [Dynamic] will work
17:20:04 <aavogt> but that's playing quite loose with the types there
17:25:14 <aavogt> and it probably involves more overhead too
17:41:55 <sm> sounds like aavogt is winning..
17:44:17 <aavogt> winning what?
17:44:23 <aavogt> "the war on bugs"?
17:47:48 <sm> aavogt: yes, on that undefined bug
18:25:25 <aavogt> yay, it seems to be fixed finally
18:27:56 <stepcut> nice
18:28:55 <aavogt> though it would just be nicer to fix the manually written Typeable instance http://hpaste.org/fastcgi/hpaste.fcgi/view?id=21428#a21428
18:29:43 <aavogt> as in making that pattern match lazy
18:30:10 <aavogt> 
ACTION wonders why the instance isn't just derived

18:59:55 <sm> aavogt: with hindsight, what led you to it ? eliminating code until it worked ?
19:00:24 <sm> "stepping" with ghci debugger ?
19:00:51 <aavogt> stepping with ghci debugger and inspecting variables
19:01:14 <sm> nice. I'll try that again next time I have something hard to find
19:01:16 <aavogt> otherwise I would have needed lots of trace statements to see at which point stuff got to be undefined
19:02:08 <aavogt> for stepping to be easier to understand it's easier when intermediate variables are named
19:15:55 <sm> good tip
20:54:22 <shapr> Has anyone built a paypal webshop with happstack?
20:55:10 <aavogt> it would be nice if you documented your progress :)
20:55:11 <st3pcut> not that I know of
20:55:43 <shapr> st3pcut: Why leet today?
20:56:00 <shapr> Ok, has anyone built a paypal webshop at all, and has some idea how hard it would be do to with happstack?
20:56:13 <st3pcut> shapr: because I am on the desktop not the laptop at the moment
20:56:21 <shapr> ah
20:56:27 <st3pcut> shapr: I have looked into paypal integration in the past
20:56:54 <st3pcut> shapr: it's not over complicated.. depends a lot on what the requirements are
20:57:16 <st3pcut> shapr: at the most basic level, you just drop some html into your page, and everything else is handled by paypal
20:57:46 <shapr> Sounds easy enough.
20:58:05 <st3pcut> there is additional integration you can do, like callbacks and stuff
20:58:21 <shapr> I'll just start by building any old happs website...
20:59:14 <st3pcut> shapr: if the items in the store don't change frequently, you can use some tool on paypals site to generate the html. They have a lot of documentation available as well if you want to generate it yourself