#define _CRT_NONSTDC_NO_WARNINGS  /* for strdup */
#include <string.h>
#include <caml/memory.h>
#include <caml/alloc.h>
#include <caml/mlvalues.h>
#include <caml/fail.h>

char *some_dynamic_string_that_should_be_freed()
{
    return strdup("bar");
}

CAMLexport value dynamic_invalid_argument(value unit)
{
    CAMLparam1(unit);
    char *dynamic_msg = some_dynamic_string_that_should_be_freed();
    value msg = caml_copy_string(dynamic_msg);
    free(dynamic_msg);
    caml_invalid_argument_value(msg);
    CAMLnoreturn;
}