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is_referenced� s zSymbol.is_referencedc C s t | jt@ �S r )rF r| r r" r r r � is_parameter� s zSymbol.is_parameterc C s" t | jttfv p | jo | jt@ �S )z0Return *True* if the sysmbol is global.
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t | j�S )a� Returns true if name binding introduces new namespace.
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