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<cemerick>
is there not an in-place deriver like `[%show int * int]` that produces a pp fun instead of a `t -> string` fun?
<cemerick>
I could have sworn there was, but it seems I'm wrong
<companion_cube>
[%pp maybe?
<cemerick>
nope, no dice
<cemerick>
s/show/show:
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<superherointj>
Hi. By any chance is anyone using OCaml with Nix/NixOS here? I need help to figure out why dune can't find a package (cmdliner in example). The package is in path. So I wonder why it is not working. https://github.com/superherointj/ocaml-nix-demo1
<superherointj>
I've been thinking: buildInputs might not be path.
<dash>
superherointj: you're putting a list inside a list
<superherointj>
Thanks!
<dash>
you have `with pkgs; [ ocaml dune_2 (with ocamlPackages; [ cmdliner ] ) ]`
<superherointj>
Got it! Will test.
<dash>
try either `with pkgs; [ ocaml dune_2 ocamlPackages.cmdliner ]` or with pkgs; [ ocaml dune_2 ] ++ (with ocamlPackages; [ cmdliner ] )`
<d_bot>
<craigfe> Fire away with your question, and someone with expertise will come along 🙂
<d_bot>
<craigfe> As someone without expertise, I believe the bind in Async has a different notion of "resolvable right away" than you may be used to if you're more used to Lwt.
<d_bot>
<craigfe> In particular, a Deferred.t that is a resolved value underneath will still yield to the scheduler for a single cycle, introducing time for a non-cooperative thread to take charge and stop your value from resolving
<d_bot>
<craigfe> (so if you have other Deferred's going on at the same time, that's something to think about)
<d_bot>
<beheddard> after screwing with it some more it seems like it is the `after` which isn't resolving, which works fine in my other uses.
<d_bot>
<beheddard> ```
<d_bot>
<beheddard> open Core
<d_bot>
<beheddard> open Async
<d_bot>
<beheddard>
<d_bot>
<beheddard> type 'a t = ('a, Pipe.Writer.phantom) Pipe.t
<d_bot>
<beheddard>
<d_bot>
<beheddard> type 'b inbox = ('b, Pipe.Reader.phantom) Pipe.t
<d_bot>
<beheddard>
<d_bot>
<beheddard> type 'b answer = State of 'b | Async of 'b Deferred.t | Stop
<d_bot>
<beheddard> let post : 'a t -> 'a -> unit Deferred.t = Pipe.write
<d_bot>
<beheddard> ```ocaml
<d_bot>
<beheddard> module Test = struct
<d_bot>
<beheddard> type msg =
<d_bot>
<beheddard> | Add of int
<d_bot>
<beheddard> | Show
<d_bot>
<beheddard> | BlockUp of float
<d_bot>
<beheddard> | BindUp of float
<d_bot>
<beheddard> | SlowShow of float
<d_bot>
<beheddard> | Fetch of int t
<d_bot>
<beheddard> | Stop
<d_bot>
<beheddard>
<d_bot>
<beheddard> let body state = function
<d_bot>
<beheddard> | Add i -> State (state + i)
<d_bot>
<beheddard> | Show -> printf "state = %d\n" state; State state
<d_bot>
<beheddard> | BlockUp secs -> begin fun () ->
<d_bot>
<beheddard> return (print_endline "(block) just a sec...") >>= fun () ->
<d_bot>
<beheddard> after (Time.Span.of_sec secs) >>= fun () ->
<d_bot>
<beheddard> return state
<d_bot>
<beheddard> end |> Thread_safe.block_on_async_exn |> fun s -> State s
<d_bot>
<beheddard> | BindUp 0. -> Async begin
<d_bot>
<beheddard> think this covers the relevant parts. It's a simple agent abstraction, like mailboxprocessor in F#
<d_bot>
<beheddard> The perma-hang happens at the (BindUp 3.0) message, since it hangs execution of the agents msg_loop
<d_bot>
<beheddard> The offending Deferred is the `after` since (BindUp 0.0) continues with no issue
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<d_bot>
<beheddard> The commented out version of Async answer handling works, as does the BlockUp message, which uses explicit `block_on_async`
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<d_bot>
<beheddard> My suspicion is that the scheduler is just not running the after contained within the BindUp handler at all, but I don't know why that might be
<d_bot>
<craigfe> (Please don't edit code-snippets in the #general channel, since the IRC bridge interprets that as a command to DoS the IRC users.)
<d_bot>
<beheddard> ah sorry, wasn't aware. I just added the ocaml tag after posting.
<d_bot>
<craigfe> np 🙂 it's not a very user-friendly or intuitive behaviour for the IRC bridge
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<d_bot>
<Bluddy> I've posted an issue on matterbridge's github. editing should not be coming through anymore. I'm not sure why the code blocks aren't recognized as one message and truncated at 400 chars (which should be the default).
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