rb_require_safe   453 encoding.c         return rb_require_safe(enclib, rb_safe_level());
rb_require_safe   291 include/ruby/intern.h VALUE rb_require_safe(VALUE, int);
rb_require_safe   430 load.c             return rb_require_safe(fname, rb_safe_level());
rb_require_safe   602 load.c             return rb_require_safe(fn, rb_safe_level());
rb_require_safe  1446 variable.c         return rb_require_safe(file, load->nd_nth);