issue #211 The type of update index op is not known.

src/lcode.c

@@ -625,6 +625,7 @@ void luaK_dischargevars (FuncState *fs, expdesc *e) {
           op = OP_RAVI_GETTABUP_SK;
         else
           op = OP_GETTABUP;  /* 't' is in an upvalue */
+        e->ravi_type = RAVI_TANY;
       }
       e->u.info = luaK_codeABC(fs, op, 0, e->u.ind.t, e->u.ind.idx);
       e->k = VRELOCABLE;