binding: Updates Jinja2 from 2.7.1 to 2.8.

third_party/jinja2/ext.py

 # -*- coding: utf-8 -*-
 """
     jinja2.ext
     ~~~~~~~~~~
 
     Jinja extensions allow to add custom tags similar to the way django custom
     tags work.  By default two example extensions exist: an i18n and a cache
     extension.
 
     :copyright: (c) 2010 by the Jinja Team.
     :license: BSD.
 """
 from jinja2 import nodes
 from jinja2.defaults import BLOCK_START_STRING, \
      BLOCK_END_STRING, VARIABLE_START_STRING, VARIABLE_END_STRING, \
      COMMENT_START_STRING, COMMENT_END_STRING, LINE_STATEMENT_PREFIX, \
      LINE_COMMENT_PREFIX, TRIM_BLOCKS, NEWLINE_SEQUENCE, \
      KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS
 from jinja2.environment import Environment
 from jinja2.runtime import concat
 from jinja2.exceptions import TemplateAssertionError, TemplateSyntaxError
 from jinja2.utils import contextfunction, import_string, Markup
-from jinja2._compat import next, with_metaclass, string_types, iteritems
+from jinja2._compat import with_metaclass, string_types, iteritems
 
 
 # the only real useful gettext functions for a Jinja template.  Note
 # that ugettext must be assigned to gettext as Jinja doesn't support
 # non unicode strings.
 GETTEXT_FUNCTIONS = ('_', 'gettext', 'ngettext')
 
 
 class ExtensionRegistry(type):
     """Gives the extension an unique identifier."""
@@ skipping 593 matching lines @@
     for lineno, func, message in extract_from_ast(node, keywords):
         yield lineno, func, message, finder.find_comments(lineno)
 
 
 #: nicer import names
 i18n = InternationalizationExtension
 do = ExprStmtExtension
 loopcontrols = LoopControlExtension
 with_ = WithExtension
 autoescape = AutoEscapeExtension