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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def fail_if_not_removed(method):
 """Decorate a test method to track removal of deprecated code This decorator catches :class:`~deprecation.UnsupportedWarning` warnings that occur during testing and causes unittests to fail, making it easier to keep track of when code should be removed. :raises: :class:`AssertionError` if an :class:`~deprecation.UnsupportedWarning` is raised while running the test method. """


    def _inner(*args, **kwargs):
        with warnings.catch_warnings(record=True) as caught_warnings:
            warnings.simplefilter("always")
            rval = method(*args, **kwargs)

        for warning in caught_warnings:
            if warning.category == UnsupportedWarning:
                raise AssertionError(
                    ("%s uses a function that should be removed: %s" %
                     (method, str(warning.message))))
        return rval

    return _inner