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| 2025-02-01 00:01:42 +0100 | merijn | (~merijn@host-vr.cgnat-g.v4.dfn.nl) (Ping timeout: 246 seconds) |
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| 2025-02-01 00:14:08 +0100 | L29Ah | (~L29Ah@wikipedia/L29Ah) L29Ah |
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| 2025-02-01 00:46:08 +0100 | jinsun | (~jinsun@user/jinsun) jinsun |
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| 2025-02-01 00:52:04 +0100 | ezzieyguywuf | (~Unknown@user/ezzieyguywuf) ezzieyguywuf |
| 2025-02-01 00:55:02 +0100 | <Leary> | kaol: Both ghcid and ghciwatch (given the right flags) allow you to effectively use the repl with `-- $> foo` comments in your code, though the latter is smarter about it---it actually loads the host module so its internals are in scope. |
| 2025-02-01 00:55:16 +0100 | merijn | (~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn |
| 2025-02-01 01:00:04 +0100 | merijn | (~merijn@host-vr.cgnat-g.v4.dfn.nl) (Ping timeout: 260 seconds) |
| 2025-02-01 01:01:22 +0100 | jinsun | (~jinsun@user/jinsun) () |
| 2025-02-01 01:08:00 +0100 | ec | (~ec@gateway/tor-sasl/ec) (Ping timeout: 264 seconds) |
| 2025-02-01 01:09:01 +0100 | <haskellbridge> | <sm> Leary: could you expand that a little ? $> foo comments ? |
| 2025-02-01 01:10:40 +0100 | merijn | (~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn |
| 2025-02-01 01:12:09 +0100 | sawilagar | (~sawilagar@user/sawilagar) (Ping timeout: 260 seconds) |
| 2025-02-01 01:15:06 +0100 | merijn | (~merijn@host-vr.cgnat-g.v4.dfn.nl) (Ping timeout: 252 seconds) |
| 2025-02-01 01:18:13 +0100 | <Leary> | sm: If you use the `--allow-eval` or `--enable-eval` flags in ghcid or ghciwatch respectively, they look for comments of the form `-- $> <code>` in your source to evaluate. |
| 2025-02-01 01:19:22 +0100 | malte | (~malte@mal.tc) (Remote host closed the connection) |
| 2025-02-01 01:22:52 +0100 | ljdarj1 | (~Thunderbi@user/ljdarj) ljdarj |
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| 2025-02-01 01:23:17 +0100 | Guest96 | (~Guest96@81-207-104-14.fixed.kpn.net) |
| 2025-02-01 01:23:59 +0100 | Guest96 | (~Guest96@81-207-104-14.fixed.kpn.net) (Client Quit) |
| 2025-02-01 01:26:02 +0100 | merijn | (~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn |
| 2025-02-01 01:26:04 +0100 | ljdarj | (~Thunderbi@user/ljdarj) (Ping timeout: 265 seconds) |
| 2025-02-01 01:26:05 +0100 | ljdarj1 | ljdarj |
| 2025-02-01 01:28:13 +0100 | <haskellbridge> | <sm> good to know! |
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| 2025-02-01 03:31:19 +0100 | vanishingideal | (~vanishing@user/vanishingideal) vanishingideal |
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| 2025-02-01 03:33:02 +0100 | euouae | (~euouae@user/euouae) euouae |
| 2025-02-01 03:33:17 +0100 | <euouae> | Hello I was using Debug.Trace to check up on sharing |
| 2025-02-01 03:33:34 +0100 | <euouae> | but e.g. `let y = trace "y-demanded" 1 in (y, y)` will print two y-demanded messages. Why? I thought 'y' would be shared in the pair expression |
| 2025-02-01 03:33:42 +0100 | merijn | (~merijn@host-vr.cgnat-g.v4.dfn.nl) (Ping timeout: 252 seconds) |
| 2025-02-01 03:33:48 +0100 | <euouae> | Is it just because sharing (for some reason) didn't happen there? |
| 2025-02-01 03:34:10 +0100 | <geekosaur> | did you use optimization? |
| 2025-02-01 03:34:19 +0100 | <geekosaur> | (if you were doing it in ghci, you weren't) |
| 2025-02-01 03:34:24 +0100 | <int-e> | compare let y = trace "y-demanded" 1 :: Integer in (y, y) |
| 2025-02-01 03:34:38 +0100 | <int-e> | then figure out why adding a type signature makes a difference |
| 2025-02-01 03:34:45 +0100 | <geekosaur> | oh, right |
| 2025-02-01 03:35:29 +0100 | <int-e> | the remark about optimizations is valid too of course |
| 2025-02-01 03:36:07 +0100 | <EvanR> | that's so tricky |
| 2025-02-01 03:36:23 +0100 | <euouae> | because the type inference prevents it from being shared? |
| 2025-02-01 03:36:34 +0100 | <geekosaur> | type inference didn't happen |
| 2025-02-01 03:36:38 +0100 | <geekosaur> | there's a piece missing |
| 2025-02-01 03:36:50 +0100 | <geekosaur> | well, it did but it didn't reach a final result |
| 2025-02-01 03:36:55 +0100 | <int-e> | :t 1 |
| 2025-02-01 03:36:56 +0100 | <lambdabot> | Num p => p |
| 2025-02-01 03:37:09 +0100 | <euouae> | it being Num doesn't tell me much I don't know what to make of it |
| 2025-02-01 03:37:13 +0100 | <EvanR> | 1 is like a function waiting to be given a Num instance |
| 2025-02-01 03:37:24 +0100 | <EvanR> | rather than a number |
| 2025-02-01 03:37:33 +0100 | <geekosaur> | :t let y = 1 in (y,y) |
| 2025-02-01 03:37:34 +0100 | <lambdabot> | (Num a, Num b) => (a, b) |
| 2025-02-01 03:37:57 +0100 | <geekosaur> | think about that one for a bit |
| 2025-02-01 03:38:12 +0100 | <euouae> | well, so it is type inference right |
| 2025-02-01 03:38:18 +0100 | <euouae> | because I can do :: (Int, Double) |
| 2025-02-01 03:38:47 +0100 | <EvanR> | :t let y = 1 in (y,y) :: (Int, Double) |
| 2025-02-01 03:38:48 +0100 | <lambdabot> | (Int, Double) |
| 2025-02-01 03:38:53 +0100 | <EvanR> | now it's a pair of numbers |
| 2025-02-01 03:38:54 +0100 | <int-e> | well sharing and lack thereof is firmly a runtime phenomenon |
| 2025-02-01 03:39:03 +0100 | <int-e> | so it's not *just* type inference |
| 2025-02-01 03:39:25 +0100 | <euouae> | Yeah, `let x = trace "foo" 1 in (x :: Int, x :: Int)` will still print two foos |
| 2025-02-01 03:39:38 +0100 | <EvanR> | pair of numbers vs "like a function waiting for two different Num instances, that may or may not happen to be the same instance" |
| 2025-02-01 03:39:40 +0100 | <euouae> | it's something more than that |
| 2025-02-01 03:40:30 +0100 | <euouae> | when you say function do you mean type function |
| 2025-02-01 03:40:37 +0100 | <EvanR> | no |
| 2025-02-01 03:40:41 +0100 | <euouae> | the `p` argument in Num p => p? |
| 2025-02-01 03:40:50 +0100 | <EvanR> | no the => in Num p => p |
| 2025-02-01 03:41:07 +0100 | <geekosaur> | as long as it has a constraint, it's like a partially applied function. (=> looks like -> for a reason) the thing that needs to be applied is an instance dictionary |
| 2025-02-01 03:41:16 +0100 | <int-e> | Concretely at runtime, the argument is a Num dictionary for p. |
| 2025-02-01 03:41:18 +0100 | nitrix | (~nitrix@user/meow/nitrix) (Quit: ZNC 1.8.2 - https://znc.in) |
| 2025-02-01 03:41:31 +0100 | <euouae> | I haven't heard of dictionary before |
| 2025-02-01 03:41:32 +0100 | <geekosaur> | by the time you apply it to the tuple, it's too late to go back and do sharing. if you specify it in the let, it can share |
| 2025-02-01 03:42:03 +0100 | <int-e> | (Dictionaries are an implementation detail of type classes.) |
| 2025-02-01 03:42:12 +0100 | <geekosaur> | have you reached typeclasses yet? |
| 2025-02-01 03:42:26 +0100 | <euouae> | No I just roughly know they have to do with interfaces |
| 2025-02-01 03:42:32 +0100 | <EvanR> | D: |
| 2025-02-01 03:42:35 +0100 | <int-e> | (And there are alternatives... notably, JHC passed type descriptors instead.) |
| 2025-02-01 03:42:37 +0100 | nitrix | (~nitrix@user/meow/nitrix) nitrix |
| 2025-02-01 03:42:39 +0100 | tabaqui1 | (~root@87.200.129.102) tabaqui |
| 2025-02-01 03:43:24 +0100 | <EvanR> | is passing type descriptors tangibly different in practice |
| 2025-02-01 03:43:27 +0100 | <geekosaur> | "interfaces" is a flawed attempt to understand typeclasses in terms of something better known, much like all the failed monad tutorials floating around the internet |
| 2025-02-01 03:43:57 +0100 | <euouae> | failure does not worry me |