rb_obj_tainted    595 include/ruby/intern.h PUREFUNC(VALUE rb_obj_tainted(VALUE));
rb_obj_tainted   1005 object.c           return rb_obj_tainted(obj);
rb_obj_tainted   3435 object.c           rb_define_method(rb_mKernel, "tainted?", rb_obj_tainted, 0);