rb_set_safe_level  616 include/ruby/ruby.h # define rb_set_safe_level(level) rb_set_safe_level(RUBY_SAFE_LEVEL_CHECK(level, error))
rb_set_safe_level   25 safe.c         #undef rb_set_safe_level
rb_set_safe_level   47 safe.c         rb_set_safe_level(int level)