ruby_safe_level_2_warning  595 include/ruby/ruby.h #   define ruby_safe_level_2_warning() ruby_safe_level_2_error()
ruby_safe_level_2_warning   26 safe.c         #undef ruby_safe_level_2_warning
ruby_safe_level_2_warning   29 safe.c         ruby_safe_level_2_warning(void)