question: public void exprSetParent ( ExpressionNode n ) { super . exprSetParent ( n ) ; int nArgs = m_argVec . size ( ) ; for ( int i = 0 ; i < nArgs ; i ++ ) { Expression arg = ( Expression ) m_argVec . elementAt ( i ) ; arg . exprSetParent ( n ) ; } }
target:  Set the parent node. For an extension function, we also need to set the parent node for all argument expressions.