rb_f_exit         370 include/ruby/intern.h NORETURN(VALUE rb_f_exit(int, const VALUE*));
rb_f_exit        7581 process.c          rb_define_global_function("exit", rb_f_exit, -1);
rb_f_exit        7605 process.c          rb_define_singleton_method(rb_mProcess, "exit", rb_f_exit, -1);