from tuple to frozenset, as this is expected to be
  a set by default.  [ticket:208]

  TemplateLookup, allows alternate Lexer classes
  to be used.

- changelog

  Markupsafe isn't installed, was using an inline-compiled
  regexp which causes major slowdowns on Python 3.3;
  is now precompiled.

  raise exception when non-existent plugin
  is specified.

  <%text> tag so that it pulls locally specified
  identifiers from the context the same
  way as that of <%block> and <%filter>.

  function arguments inside pure-python def
  or lambda expressions.  [ticket:201]

  parsing for Py2.4 was broken.
  [ticket:193]

  involving variables declared in defs and such,
  which only became apparent when
  the strict_undefined flag was turned on.
  [ticket:192]

  same time args passed to def() are used
  by other elements of the <%def> tag.
  [ticket:191]

  now succeed, as "pass" is added for these
  when no statements are otherwise present.
  Courtesy Ben Trofatter [ticket:146]

- fix up links, formatting in docs
- remove some repetition in the _compile logic

  "pass_context"; when True, the keyword argument
  'context' will be passed to get_or_create()
  containing the Mako Context object.
  [ticket:185]

- changelog

  apply Pygments highlighting to the source
  code displayed in the traceback, if Pygments
  if available.  Courtesy Ben Trofatter
  [ticket:95]

  i.e. "% with x as e:/ % endwith" support.
  Courtesy Ben Trofatter [ticket:147]

  nesting multiple def-calls with content.
  Thanks to Jeff Dairiki. [ticket:186]

  to filehandles being implicitly closed.
  [ticket:182]

  Cache() constructor, which was preventing file
  version checks and not allowing Mako 0.6 to
  recompile the module files.

  (even though several of those old template libs aren't
  available on Py3K, so YMMV) [ticket:175]

  in templates.   Usage of regions should be considered
  as superseding the very obsolete idea of passing in
  backend options, timeouts, etc. within templates.
- rewrite the cache docs again which had a lot of misleading/inaccurate
info.

  TemplateLookup, allows a callable to be passed which
  takes over the writing of the template's module source
  file, so that special environment-specific steps
  can be taken.  [ticket:181]

  for code blocks so that indentation is preserved
  [ticket:173]

  is now escaped with the HTML filter. [ticket:142]

  within extra arguments to <%block>, <%def>, i.e.
  <%block name="foo" cache_key="${somekey}">.
  Filters can also be used in this way, i.e.
  <%def name="foo()" filter="myfilter">
  then template.render(myfilter=some_callable)
  [ticket:180]

  script, allows passing of kw to the template from
  the command line. [ticket:178]

  system, whereby the usage of Beaker is just the
  default plugin.   Template and TemplateLookup
  now accept a string "cache_impl" parameter which
  refers to the name of a cache plugin, defaulting
  to the name 'beaker'.  New plugins can be
  registered as pkg_resources entrypoints under
  the group "mako.cache", or registered directly
  using mako.cache.register_plugin().  The
  core plugin is the mako.cache.CacheImpl
  class.

- The <%def>, <%block> and <%page> tags now accept
  any argument named "cache_*", and the key
  minus the "cache_" prefix will be passed as keyword
  arguments to the CacheImpl methods.

- Template and TemplateLookup now accept an argument
  cache_args, which refers to a dictionary containing
  cache parameters.  The cache_dir, cache_url, cache_type,
  cache_timeout arguments are deprecated (will probably
  never be removed, however) and can be passed
  now as cache_args={'url':<some url>, 'type':'memcached',
  'timeout':50, 'dir':'/path/to/some/directory'}

  from having a url that normalizes to relative outside
  of the root.   That is, if the Lookup is based
  at /home/mytemplates, an include that would place
  the ultimate template at
  /home/mytemplates/../some_other_directory,
  i.e. outside of /home/mytemplates,
  is disallowed.   This usage was never intended
  despite the lack of an explicit check.
  The main issue this causes
  is that module files can be written outside
  of the module root (or raise an error, if file perms aren't
  set up), and can also lead to the same template being
  cached in the lookup under multiple, relative roots.
  TemplateLookup instead has always supported multiple
  file roots for this purpose.
  [ticket:174]

  whereby the identity of the "caller" callable
  inside the <%def> would be corrupted by the
  presence of another <%call> in the same block.
  [ticket:170]

  [ticket:169]

  evaluates its contents in-place.
  Can be named or anonymous,
  the named version is intended for inheritance
  layouts where any given section can be
  surrounded by the <%block> tag in order for
  it to become overrideable by inheriting
  templates, without the need to specify a
  top-level <%def> plus explicit call.
  Modified scoping and argument rules as well as a
  more strictly enforced usage scheme make it ideal
  for this purpose without at all replacing most
  other things that defs are still good for.
  Lots of new docs. [ticket:164]

  for generating template bound stacktraces.
  Will stick to known template source lines
  without any extra guessing. [ticket:165]