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#define CAML_NAME_SPACE
#include "caml/mlvalues.h"
#include "caml/fail.h"
#include "caml/callback.h"
value c_fun(void)
{
const value *callback = caml_named_value("callback");
value v = caml_callback(*callback, Val_unit);
if (Is_exception_result(v))
return Val_long(-1);
return Val_long(Long_val(v) + 1);
}
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