should handle exception from Ruby implemented method called from funcall; close #484

src/vm.c

@@ -455,7 +455,6 @@ mrb_run(mrb_state *mrb, struct RProc *proc, mrb_value self)
   int ai = mrb->arena_idx;
   jmp_buf *prev_jmp = (jmp_buf *)mrb->jmp;
   jmp_buf c_jmp;
-  ptrdiff_t ciidx = mrb->ci - mrb->cibase;
 
 #ifdef DIRECT_THREADED
   static void *optable[] = {
@@ -1096,13 +1095,13 @@ mrb_run(mrb_state *mrb, struct RProc *proc, mrb_value self)
         ci = mrb->ci;
 	eidx = mrb->ci->eidx;
         if (ci == mrb->cibase) goto L_STOP;
-        if (ciidx == ci - mrb->cibase){
-          mrb->jmp = prev_jmp;
-          longjmp(*(jmp_buf*)mrb->jmp, 1);
-        }
         while (ci[0].ridx == ci[-1].ridx) {
           cipop(mrb);
           ci = mrb->ci;
+	  if (ci[1].acc < 0 && prev_jmp) {
+	    mrb->jmp = prev_jmp;
+	    longjmp(*(jmp_buf*)mrb->jmp, 1);
+	  }
 	  while (eidx > mrb->ci->eidx) {
 	    ecall(mrb, --eidx);
 	  }