The `ci` should not be equal to `cibase` with `OP_R_BREAK`;
MODIFY
src/vm.c
src/vm.c
@@ -2065,6 +2065,9 @@ RETRY_TRY_BLOCK:
}
ci--;
}
+ if (ci == mrb->c->cibase) {
+ goto L_BREAK_ERROR;
+ }
break;
default:
/* cannot happen */

The `ci` should not be equal to `cibase` with `OP_R_BREAK`; #3871