CHECK_ARRAY      5271 compile.c      	VALUE arg_opt_labels = CHECK_ARRAY(rb_ary_entry(args, i++));
CHECK_ARRAY       380 iseq.c             data        = CHECK_ARRAY(data);
CHECK_ARRAY       392 iseq.c             locals      = CHECK_ARRAY(rb_ary_entry(data, i++));
CHECK_ARRAY       395 iseq.c             if (FIXNUM_P(args) || (args = CHECK_ARRAY(args))) {
CHECK_ARRAY       399 iseq.c             exception   = CHECK_ARRAY(rb_ary_entry(data, i++));
CHECK_ARRAY       400 iseq.c             body        = CHECK_ARRAY(rb_ary_entry(data, i++));