Initialize `kdict` in `OP_ENTER` in `vm.c`.
@@ -1732,7 +1732,7 @@ RETRY_TRY_BLOCK:
int const len = m1 + o + r + m2;
int const blk_pos = len + kd + 1;
mrb_value *blk = &argv[argc < 0 ? 1 : argc];
- mrb_value kdict;
+ mrb_value kdict = mrb_nil_value();
int kargs = kd;
/* arguments is passed with Array */
