<Leonidas>
companion_cube: I like the foldy thing in your readme, had to look up how its done :-)
<companion_cube>
yeah I discovered that recently!
<companion_cube>
Drup: it's been a while, really.
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<companion_cube>
zozozo and I have been using that years ago
<companion_cube>
but the text renderer is getting better
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<GeoffK>
in utop how do i get access for filter_map from Core_list?
<Drup>
companion_cube: how do you make sure the code has access to the local libraries for the mdx test ?
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<Leonidas>
hmm, when building a tarball with dune-release it seems %{project_root} is unset
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<companion_cube>
Drup: when it's run through dune it seems that `require` works
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<Drup>
huh, really ? It's not because the library is installed ?
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<companion_cube>
well it works on travis, so either the travis script installs before running tests (I doubt so) or dune makes it works
<companion_cube>
I think I tested locally after uninstalling the lib, just to be sure
<Drup>
ok, that makes it really nice indeed
<companion_cube>
(you're more than welcome to test the hypothesis separately)
<companion_cube>
but yeah, mdx is pretty nice in the end
<companion_cube>
and `...` allows to skip some parts of the output (useful if it contains some non-deterministic part)
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<cemerick>
style question: it seems that a lot of APIs expect unit funs (`() -> 'a`) where a `'a Lazy.t` would maybe be more appropriate (i.e. to avoid inadvertent repeated side effects). Is that just a historical artifact, or is there something more to it?
<companion_cube>
unit -> a can be more lightweight if used only once
<companion_cube>
lazy has to do additional bookeeping to memoize the value once computed
<cemerick>
that's fair
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<cemerick>
I'd almost expect that extra bookkeeping to get optimized away if it's clear that it's only forced once, but probably not a focus of the compiler
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<cemerick>
companion_cube: I ask because I started using this, if you remember our convo about a lazy `<+>`
<cemerick>
been using `let (<|>) a b = if Option.is_some a then a else Lazy.force b` just because lazys end up just looking nicer vs. lots of `fun _ ->`'s
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<lorp>
hey people, new to ocaml, question - is there a way to make a product type in ocaml by "mixing in" two types, like & in typescript?
<lorp>
i specifically mean in records, the use case is to construct a type to be json representable by mixing multiple types
<Drup>
lorp: You can't really do that directly in OCaml. Polymorphic variants are a slightly more limited version of that
<lorp>
Drup, thanks, i guess all i need is some support in atd for mixing/embeddings, maybe someone here knows if such a thing exists
<Drup>
I'm surprised if atdgen doesn't already have everything you need
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<AnAverageHuman>
Is there an opam switch that refers to the system ocaml?
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<kjak>
AnAverageHuman: do you mean "opam switch system" ? is that what you're looking for or do you mean something else?
<AnAverageHuman>
kjak: I'm trying to package ocamlformat for a distro but the Makefile is trying to execute `opam switch show`, which complains that `opam init` hasn't been run. So I tried to swap out '@OPAM_SWITCH@` for `system` in the dune-workspace https://github.com/ocaml-ppx/ocamlformat/blob/master/dune-workspace.in but then I get [ERROR] The current switch (system) is an unknown compiler switch.
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<companion_cube>
cemerick: in a way yes, `lazy` looks better, but `fun() -> …` is fine too
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<companion_cube>
yay, I re-discovered a bug in uutf! 🎉
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