Using ocaml-3.09.3-win-msvc When I compile the following program as byte code I see a stack overflow (expected). When using ocamlopt it seems that the program dies and I do not see the expected overflow exception? >type overflow.ml let array_1=Array.make 229376 42;; let _ = Printf.printf "A\n";; flush stdout;; let array_2=Array.make 32768 43;; let _ = Printf.printf "B\n";; flush stdout;; let list_1 = Array.to_list(array_1);; let _ = Printf.printf "C\n";; flush stdout;; let list_2 = Array.to_list(array_2);; let _ = Printf.printf "D\n";; flush stdout;; let list_3 = list_1@list_2;; let _ = Printf.printf "E\n";; flush stdout;; >ocamlc overflow.ml -o overflow_ocamlc.exe >overflow_ocamlc.exe A B C D Fatal error: exception Stack_overflow >echo %ERRORLEVEL% 2 >ocamlopt overflow.ml -o overflow_ocamlopt.exe >overflow_ocamlopt.exe A B C D >echo %ERRORLEVEL% -1073741819 Is this a bug? Thanks, - Jakob Lichtenberg