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<narimiran>
is there some rule/preference when you declare two independent variables in a function: should you use `let a = .... and b = ....` or `let a = ... in let b = ...`?
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<sim642>
I'm not sure I have seen "and" used with a non-rec let
<narimiran>
the reason why i'm asking is because technically `a` is not used *in* `b`, so the second example feels wrong. but i'm just ocaml beginner :)
<sim642>
The (let b = ... in ...) is a complete expresion in itself so it would still be used inside that, even when not in the definition of b
<sim642>
From a very practical aspect, using a chain of let...in-s makes it easy to comment out or delete individual definitions
<sim642>
If you used "and" that would be more difficult if you want to change the first one or reorder them
<narimiran>
sim642: believe it or not, the (un)easy commenting out is the real reason why i'm asking :)
<narimiran>
i thought `and` version is idiomatic, but it is difficult to comment out, so i'd like to switch to `let ... in`
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<Leonidas>
I think `end` is only idiomatic in cases where it can't be expressed with 2 separate binds.
<Leonidas>
that is multually recursive binds
<Leonidas>
otherwise, at least for me, `and` signifies that there is something going on, that isn't.
<Leonidas>
similarly to defining functions `let rec` that don't need it
<sarahzrf>
i made a new opam switch in order to test out an upgraded package setup
<sarahzrf>
can i just copy it over somehow?
<sarahzrf>
i cant remember; will the build artifacts get cached if i do a plain install in the real switch or something
<sarahzrf>
evidently no
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<Leonidas>
only once dune 2 rolls out
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<narimiran>
another noob question: i'm using dune (as per general recommendation here), and i have multiple executables in the same directory plus one library i created in a `lib` subfolder. i'm trying to generate .mli file for one of my executables. i created a mli profile in my dune file for which i have `(ocamlopt_flags (:standard -i))`
<narimiran>
the problem is, when i try to do `dune exec --profile mli filename.exe`, it prints mli of my lib (not my executable), and then "Error: Rule failed to generate the following targets:" with some/path/to/lib.cmx and some/path/to/lib.o
<narimiran>
on the other hand, if i just do `ocamlopt -i filename.ml`, then i get "Error: Unbound module <external lib>"
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<narimiran>
so i guess the question is: how to generate .mli file when you have various dependencies? (preferably with dune, if possible)
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<Leonidas>
I just generate the signatures with merlin, paste them into an mli and fix whatever weird type aliases it has come up with.
<Leonidas>
mli for executables is pretty much useless though, I would recommend to not bother at all
<Leonidas>
also, put each library and each executable into its own folder. that makes it easier to generate correct merlin files and is also nicer from a code organisation point of view
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<narimiran>
Leonidas: i'm just using this to quickly go through the files and see where i have unneeded generic types for proc parameters (i've read that might make executables slower)
<narimiran>
i'm using merlin quite frequently when i'm writing stuff, but (unless there is a way i don't know about) merlin cannot produce types for the whole file, only for stuff under my cursor
<narimiran>
regarding folder organization: i've seen projects with layout like you recommend, but for this simple case (AoC tasks) it seemed like an overkill. this way i only have one dune file for the whole project, instead of one per sub-folder
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<Leonidas>
narimiran: you should not worry about potential issues before you run into them. it makes more sense to actually profile instead of preemptively guessing.
<Leonidas>
narimiran: the trick is to wrap module M = struct (your file) end, and then ask merlin for the type of M.
<narimiran>
Leonidas: oooh, i never thought about `module M = ....` idea. nice trick, thanks!
<narimiran>
Leonidas: to profile if there are differences between two versions - i need to have another version in the first place ;) and that's why i went on this "lets discover generic types" trip
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