Hello, 

Next dialog shell describe problem:

$ ocamlc -version
  3.07+2
$ camlp4o -v
  Camlp4 version 3.07+2
$ cat a.ml
  let test () =
        raise Not_found;;
  test ();;
$ export OCAMLRUNPARAM=b

Without camlp4 all ok.

$ ocamlc -g a.ml
$ ./a.out
  Fatal error: exception Not_found
  Raised at file "a.ml", line 2, character 16
  Called from file "a.ml", line 3, character 7

But if I use camlp4o, output after exception:

$ ocamlc -pp camlp4o -g a.ml
$ ./a.out
Fatal error: exception Not_found
Raised at file "", line 1, character 31
Called from file "", line 1, character 41

So, file names and line numbers are missing.

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