From a44966457b7f796872e324182f96fc436d35d995 Mon Sep 17 00:00:00 2001
From: DagSverreSeljebotn <none@none>
Date: Tue, 25 Nov 2008 12:30:05 -0800
Subject: [PATCH] fix for infinite loop in buffer code

---
 Cython/Compiler/Buffer.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Cython/Compiler/Buffer.py b/Cython/Compiler/Buffer.py
index c53a5ca4..ad1bce58 100644
--- a/Cython/Compiler/Buffer.py
+++ b/Cython/Compiler/Buffer.py
@@ -710,7 +710,11 @@ def use_py2_buffer_functions(env):
 
     # Search all types for __getbuffer__ overloads
     types = []
+    visited_scopes = set()
     def find_buffer_types(scope):
+        if scope in visited_scopes:
+            return
+        visited_scopes.add(scope)
         for m in scope.cimported_modules:
             find_buffer_types(m)
         for e in scope.type_entries:
-- 
2.26.2