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    jinja2.meta
    ~~~~~~~~~~~

    This module implements various functions that exposes information about
    templates that might be interesting for various kinds of applications.

    :copyright: (c) 2010 by the Jinja Team, see AUTHORS for more details.
    :license: BSD, see LICENSE for more details.
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a set of all variables in the AST that will be looked up from
    the context at runtime.  Because at compile time it's not known
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    variables will be used depending on the path the execution takes at
    runtime, all variables are returned.

    >>> from jinja2 import Environment, meta
    >>> env = Environment()
    >>> ast = env.parse('{% set foo = 42 %}{{ bar + foo
}}')
    >>> meta.find_undeclared_variables(ast)
    set(['bar'])

    .. admonition:: Implementation

       Internally the code generator is used for finding undeclared
variables.
       This is good to know because the code generator might raise a
       :exc:`TemplateAssertionError` during compilation and as a matter of
       fact this function can currently raise that exception as well.
   
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all the referenced templates from the AST.  This will return an
    iterator over all the hardcoded template extensions, inclusions and
    imports.  If dynamic inheritance or inclusion is used, `None` will be
    yielded.

    >>> from jinja2 import Environment, meta
    >>> env = Environment()
    >>> ast = env.parse('{% extends "layout.html"
%}{% include helper %}')
    >>> list(meta.find_referenced_templates(ast))
    ['layout.html', None]

    This function is useful for dependency tracking.  For example if you
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    to rebuild parts of the website after a layout template has changed.
    N(tfind_allRtExtendst
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