# HG changeset patch
# User hodgestar
# Date 1359201570 0
# Node ID 0d4e1bafad8fcfc8c78fbb5752b1b7831f7f428a
# Parent  8d4625183417b20b6f0d04efa516df24ea68bc61
Merge r1213 from trunk (fix infinite loop in interpolation brace matching caused by a change in 2.7).

diff --git a/genshi/template/interpolation.py b/genshi/template/interpolation.py
--- a/genshi/template/interpolation.py
+++ b/genshi/template/interpolation.py
@@ -115,7 +115,9 @@
             level = 1
             while level:
                 match = token_re.match(text, pos)
-                if match is None:
+                if match is None or not match.group():
+                    # if there isn't a match or the match is the empty
+                    # string, we're not going to match up braces ever
                     raise TemplateSyntaxError('invalid syntax',  filepath,
                                               *textpos[1:])
                 pos = match.end()