Clear `c->prev` on fiber termination.
MODIFY
src/vm.c
src/vm.c
@@ -1968,6 +1968,8 @@ RETRY_TRY_BLOCK:
case OP_R_NORMAL:
NORMAL_RETURN:
if (ci == mrb->c->cibase) {
+ struct mrb_context *c;
+
if (!mrb->c->prev) { /* toplevel return */
localjump_error(mrb, LOCALJUMP_ERROR_RETURN);
goto L_RAISE;
@@ -1981,8 +1983,10 @@ RETRY_TRY_BLOCK:
ecall(mrb);
}
/* automatic yield at the end */
- mrb->c->status = MRB_FIBER_TERMINATED;
- mrb->c = mrb->c->prev;
+ c = mrb->c;
+ c->status = MRB_FIBER_TERMINATED;
+ mrb->c = c->prev;
+ c->prev = NULL;
mrb->c->status = MRB_FIBER_RUNNING;
ci = mrb->c->ci;
}

Clear `c->prev` on fiber termination.