def _dummy(name, token, expr, **kwargs):
    d = _dummy_(name, token, **kwargs)
    if d in expr.free_symbols:
        return Dummy(name, **kwargs)
    return d
Sets an ancestor for this query.
dataset/ETHPy150Open sympy/sympy/sympy/integrals/meijerint.py/_dummy--crossover with--dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/db/__init__.py/Query.ancestor