[Caml] Call caml_to_c
[C] Enter caml_to_c
[C] Call c_to_caml
[Caml] Enter c_to_caml
[Caml] c_to_caml: raise exception
[Caml] Caught exception
[C] Enter caml_to_c
[C] Call c_to_caml
[Caml] Enter c_to_caml
[Caml] c_to_caml: raise exception
[Caml] Caught exceception again
[Caml] Done