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    This module implements various functions that exposes information about
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    :license: BSD, see LICENSE for more details.
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    >>> env = Environment()
    >>> ast = env.parse('{% set foo = 42 %}{{ bar + foo }}')
    >>> meta.find_undeclared_variables(ast) == set(['bar'])
    True

    .. admonition:: Implementation

       Internally the code generator is used for finding undeclared variables.
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    >>> env = Environment()
    >>> ast = env.parse('{% extends "layout.html" %}{% include helper %}')
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