Merge branch '0.23.x'

CHANGES.rst

@@ -40,6 +40,12 @@ Other changes
 Bugs fixed
 ----------
 
+* Invalid C code for generators.  This fixes ticket 858.
+
+* Invalid C code for some builtin methods.  This fixes ticket 856.
+
+* Test failures on 32bit systems.  This fixes ticket 857.
+
 * Code that uses "from xyz import *" and global C struct/union/array
   variables could fail to compile due to missing helper functions.
   This fixes ticket 851.

Cython/Compiler/Optimize.py

@@ -4202,7 +4202,7 @@ class FinalOptimizePhase(Visitor.CythonTransform, Visitor.NodeRefCleanupMixin):
                 if function.type is Builtin.type_type:
                     may_be_a_method = False
                 elif function.is_attribute:
-                    if function.entry.type.is_cfunction:
+                    if function.entry and function.entry.type.is_cfunction:
                         # optimised builtin method
                         may_be_a_method = False
                 elif function.is_name: