luaK_concat
luaK_concat(fs, &fs->jpc, list);
luaK_concat(fs, &e->t, e->u.info); /* put this jump in `t' list */
luaK_concat(fs, &j, jpc); /* keep them on hold */
luaK_concat(fs, &e->f, pc); /* insert last jump in `f' list */
luaK_concat(fs, &e->t, pc); /* insert last jump in `t' list */
luaK_concat(fs, &e2->f, e1->f);
luaK_concat(fs, &e2->t, e1->t);
LUAI_FUNC void luaK_concat (FuncState *fs, int *l1, int l2);
luaK_concat(fs, escapelist, luaK_jump(fs)); /* must jump over it */