opam - Lack of information when OCaml crashes

Question

I am new to OCaml which I installed via opam. My compiler is dune. Each time I build my project and run it, it crashes but I get no information from where it crashes in the code.

A friend of mine who is doing the same thing get information about the line where it crashes.

If anyone have an idea it will be incredible !

Best regards,

question from:https://stackoverflow.com/questions/65868770/lack-of-information-when-ocaml-crashes

Answer 1

You could add the following in you main, which turns on the recording of exception backtraces:

let main =
  record_backtrace true;
...

Alternativelly, you can set the b flag through the OCAMLRUNPARAM variable.