include_modules_at  849 class.c        static int include_modules_at(const VALUE klass, VALUE c, VALUE module, int search_super);
include_modules_at  864 class.c            changed = include_modules_at(klass, RCLASS_ORIGIN(klass), module, TRUE);
include_modules_at  989 class.c            changed = include_modules_at(klass, klass, module, FALSE);