rb_singleton_class_get  888 internal.h     VALUE rb_singleton_class_get(VALUE obj);
rb_singleton_class_get 1655 proc.c         	if (!NIL_P(klass = rb_singleton_class_get(obj)) &&
rb_singleton_class_get 1664 proc.c             if (NIL_P(klass = rb_singleton_class_get(obj)) ||