From: Stefan Behnel <scoder@users.berlios.de>
Date: Wed, 9 Dec 2009 15:43:31 +0000 (+0100)
Subject: comment
X-Git-Tag: 0.12.1~47
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=3f305e439fdcc21c9f5536402898b5892c0ee1be;p=cython.git

comment
---

diff --git a/Cython/Compiler/Optimize.py b/Cython/Compiler/Optimize.py
index c6500bbe..8c97b074 100644
--- a/Cython/Compiler/Optimize.py
+++ b/Cython/Compiler/Optimize.py
@@ -616,6 +616,9 @@ class DropRefcountingTransform(Visitor.VisitorTransform):
     visit_Node = Visitor.VisitorTransform.recurse_to_children
 
     def visit_ParallelAssignmentNode(self, node):
+        """
+        Parallel swap assignments like 'a,b = b,a' are safe.
+        """
         left_names, right_names = [], []
         left_indices, right_indices = [], []
         temps = []