From bfa008a7ce13eff2f59b022e8c2d5d71d77f9ecb Mon Sep 17 00:00:00 2001
From: Andres Noetzli <andres.noetzli@gmail.com>
Date: Wed, 12 Feb 2020 16:16:21 -0800
Subject: [PATCH] [Python] Properly destroy CVC4 object (#3753)

---
 src/cvc4.i | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/cvc4.i b/src/cvc4.i
index 9e69212ae..bed988b32 100644
--- a/src/cvc4.i
+++ b/src/cvc4.i
@@ -69,10 +69,9 @@ std::set<JavaInputStreamAdapter*> CVC4::JavaInputStreamAdapter::s_adapters;
 
 #ifdef SWIGPYTHON
 %pythonappend CVC4::SmtEngine::SmtEngine %{
-  self.thisown = 0
-%}
-%pythonappend CVC4::ExprManager::ExprManager %{
-  self.thisown = 0
+  # Hold a reference to the ExprManager to make sure that Python keeps the
+  # ExprManager alive as long as the SmtEngine exists
+  self.em = em
 %}
 #endif /* SWIGPYTHON */
 
-- 
2.30.2