companion_cube changed the topic of #ocaml to: Discussion about the OCaml programming language | http://www.ocaml.org | OCaml 4.14.0 released: https://ocaml.org/releases/4.14.0.html | Try OCaml in your browser: https://try.ocamlpro.com | Public channel logs at https://libera.irclog.whitequark.org/ocaml/
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<olle> So, professional-level error messages in a compiler is *hard*
<olle> Or?
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<Leonidas> Armael: I'm looking at the ^^^^^^ highlighting in the compiler and wonder, is there a way to trigger its display programmatically? I currently print the error message with Location.report_exception but it doesn't highlight the source location
<Fardale> Leonidas: is this what you are looking for https://github.com/Armael/pp_loc ?
<Leonidas> Fardale: yes, kind of. The thing is I'm getting all these fun exceptions from the execution of the code and I am wondering how to reliably get the beginning and end locations of the issues (that I need for pp_loc's Position.t)
<Leonidas> And maybe I can get away without having to use pp_loc, if I can coerce the compiler to print it by itself
<companion_cube> it's tricky and the compiler is full of global state
<Leonidas> Also compiler libs are unstable between versions, so it might end up painful
<companion_cube> s/might/will/
<companion_cube> (also it depends on whether you have a tty, non dummy TERM var, etc.)
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<Armael> Leonidas: what's your setup exactly? are the errors / locations that you want to print something that you emitted yoursefl?
<Armael> I don't remember exactly how it works in the compiler tbh
<companion_cube> it changes from version to version
<Armael> what changes?
<companion_cube> error reporting
<Armael> but yeah using Pp_loc is probably easier than trying to hook up with the compiler if you're just trying to print your own errors
<companion_cube> I think it's becoming cleaner, but it changes
<Armael> not sure that the location printing code is changing tho?
<companion_cube> e.g. it's only in 4.13 or 4.14 that the compiler has started re-emitting all warnings when you recompile a file, I think?
<companion_cube> ah, maybe not.
<Armael> but theres possibly a hook in Location that you can redefine if you wanna be dirty
<Armael> Location.register_error_of_exn possibly
<Armael> iirc that's what the rest of the compiler uses to turn exceptions into error reports
<Armael> not sure where the exn handler for that is installed tho, might only work if you're invoking a normal compiler entrypoint
<Armael> (sorry, not in front of a PC so my investigation abilities are limited :p)
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<sim642> companion_cube, what? isn't that just a dune/etc thing that you don't get warnings again because the file isn't simply recompiled?
<companion_cube> maybe it's dune that does that, I'm honestly not sure
<sim642> It often trips me up as well because the first time I see a warning, I was in the middle of something and don't immediately fix it, but then later forget since I don't see it again
<sim642> Maybe it's the secret reason dune has warnings as errors by default
<sim642> It just doesn't want to deal with somehow remembering warnings and reprinting them for untouched files
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<olle> Damn
<olle> This '(' might be unmatched
<olle> Can't see it -.-
<olle> 51 Return (Plus (Num 1) (Num 1))
<olle> 56 | Plus of expression * expression
<olle> 55 | Num of int
<olle> Myeh
<sim642> Plus (Num 1, Num 1)
<olle> Crap
<olle> ><
<sim642> This isn't haskell
<olle> sim642: thanks
<olle> sim642: No, it's because the debug dump from [%test_eq] is in sexp format!
<olle> I thought I could copy-paste ><
<olle> Hmmm, wonder if I got it right with the precedence now
<mclovin> well, even if it's not haskell, you can still do this : https://paste.isomorphis.me/Teu :D
<olle> Not sure what I'm looking at
<olle> o0
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