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    the context at runtime.  Because at compile time it's not known which
    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) == {'bar'}
    True

    .. 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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    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]

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