#ocaml on 2021-05-11 — irc logs at freenode.irclog.whitequark.org

2020-09-11 13:16 companion_cube changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml 4.11 release notes: https://caml.inria.fr/pub/distrib/ocaml-4.11/notes/Changes | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml

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01:54 <hackinghorn> heh, I just found out there is nothing separating statements

01:55 <hackinghorn> I just write "let" and it begins a new statement

01:57 <hackinghorn> why does sometimes we have "in", for example, "" let funa args = ... in let funb args = ... "" , sometimes, I see no "in"

02:02 <companion_cube> when there's no `in` it's a toplevel statement

02:02 <companion_cube> when there's a `in` it's a local definition in a bigger expression

02:21 <hackinghorn> wah, I see, thankss companion_cube

02:22 <hackinghorn> companion_cube, so if I'm in a function, I probably need to write everything ending with "in" or it will become toplevel?

02:26 <hackinghorn> the tutorials all use toplevel and everything ends with ";;", it makes it very hard for me working with real files :/

02:51 <d_bot> <darrenldl> well if you're in a function, you cant end an inner let binding without "in" anyway

02:52 <d_bot> <darrenldl> e.g. "let f x = let y = 1" is not correct syntax

02:53 <d_bot> <darrenldl> i wrote an exercise for a student at one point about this confusion, i might still have a copy...

03:20 <hackinghorn> usually I write let y = 1 in let f x = [..]. I think thats equivalent?

04:03 <d_bot> <Firgeis> Anyone here know any of the maintainers of the repo https://github.com/savonet/ocaml-ssl ?

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05:45 <d_bot> <undu> I wish the compatibility PR with older openssl version were merged

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07:57 <d_bot> <mseri> Not really, but some of them are in the ocaml discuss forum . However, There is a small request from the review that is still unaddressed if this is the PR you have in mind: https://github.com/savonet/ocaml-ssl/pull/63

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13:08 <d_bot> <Firgeis> This one actually https://github.com/savonet/ocaml-ssl/pull/71

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14:01 <d_bot> <Ulugbek> Is it possible to show the doc for a symbol in utop?

14:05 <d_bot> <Anurag> There is a PR to add a new directive that will have documentation details. That said in the past i've used <https://github.com/reynir/ocp-index-top> to get a `#doc` directive for utop.

14:06 <d_bot> <Anurag> Forgot to share the link to the Utop PR: https://github.com/ocaml-community/utop/pull/294

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14:44 <d_bot> <dj charlie> ```

14:44 <d_bot> <dj charlie> sed -e "s@File \"(stdin)\", line $[0-9]*$@$samfile:\1@g" | \

14:44 <d_bot> <dj charlie> sed -e "s@File \"(stdin)\", lines $[0-9]*$-$[0-9]*$,@$samfile:\1,\2@g"``` replaced my monolithic script with this lol

14:44 <d_bot> <dj charlie> anyone got any hot tips to make it a single pass?

14:45 <d_bot> <dj charlie> awesome :^))))

14:45 <d_bot> <darrenldl> hackinghorn: y has a different scope in that case, so not exactly equivalent

14:45 <d_bot> <darrenldl>

14:45 <d_bot> <darrenldl> the point is you cannot end an inner let binding as if it is a top level let binding

14:46 <companion_cube> it's jsut a wart of the language, toplevel `let` should really have been `val` or sth like that

14:47 <d_bot> <dj charlie> might just use a ppx for regex do it ez

14:48 <companion_cube> what is it that you're trying to do?

14:50 <d_bot> <dj charlie> just translate some ocaml messages into something friendlier

14:50 <d_bot> <dj charlie> i'll just use the ppx_regexp package instead 🙂

14:50 <companion_cube> 🤷

14:50 <companion_cube> I think theer's a switch with better error messages? anyway

14:59 <d_bot> <dj charlie> really? dope

14:59 <d_bot> <dj charlie> had no idea

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15:13 <steenuil> does Unix.write take a bytes value just for convenience or does it actually mutate it?

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15:20 <companion_cube> it doesn't mutate it

15:20 <companion_cube> it's just that IO buffers are generally mutable, someone has been writing into the bytes before most likely

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15:31 <steenuil> yeah I suspected that, thanks

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19:33 <hackinghorn> hi, why does "open Core" give me "unbound module Core". I'm building 1 file with "dune build"

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19:38 <d_bot> <Anurag> Did you add `core` in the `libraries` section of your dune file?

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19:54 <hackinghorn> oh that might works, thx

19:55 <hackinghorn> is there a command for that?

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19:58 <d_bot> <Anurag> No, you'd need to manually add the dependencies you care about to the `libraries` section in your dune file.

19:59 <hackinghorn> ahh I see, thankss

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22:42 <catern> apologies for this basic question, but I expect it will be very easy to answer: does OCaml have support for running arbitrary code at compile time? for example, parsing a string into a data-structure, and getting parse errors at compile time. maybe this can be done cleverly by using the module system?

22:49 <companion_cube> no, not outside preprocessors (ppx)

22:58 <catern> makes sense, thanks for answering

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