From 2095fd57def568c6df0e43403c5ee45019f9f732 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Lindqvist?= <bjourne@gmail.com>
Date: Tue, 18 Nov 2014 01:56:43 +0100
Subject: [PATCH] VM: FACTOR_ASSERT so that data_root never wraps a null
 pointer, cause if it does, random crashes can happen

---
 vm/data_roots.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/vm/data_roots.hpp b/vm/data_roots.hpp
index 94be9695d2..a7c702408c 100644
--- a/vm/data_roots.hpp
+++ b/vm/data_roots.hpp
@@ -14,6 +14,7 @@ template <typename Type> struct data_root : public tagged<Type> {
 
   data_root(Type* value, factor_vm* parent)
       : tagged<Type>(value), parent(parent) {
+    FACTOR_ASSERT(value);
     push();
   }