From 424c56006dc52dfaa0dc7ba55c7a724ed39b6b78 Mon Sep 17 00:00:00 2001
From: ridiculousfish <corydoras@ridiculousfish.com>
Date: Sun, 10 Nov 2019 13:31:47 -0800
Subject: [PATCH] Add a paranoid assert to io_chain_t::append

---
 src/io.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/io.cpp b/src/io.cpp
index 6bf0782b4..620c627ac 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -215,6 +215,7 @@ void io_chain_t::push_back(shared_ptr<io_data_t> element) {
 }
 
 void io_chain_t::append(const io_chain_t &chain) {
+    assert(&chain != this && "Cannot append self to self");
     this->insert(this->end(), chain.begin(), chain.end());
 }