@Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        ProcedureCallNode other = (ProcedureCallNode) obj;
        if (actualParameters == null) {
            if (other.actualParameters != null)
                return false;
        } else if (!actualParameters.equals(other.actualParameters))
            return false;
        if (ident == null) {
            if (other.ident != null)
                return false;
        } else if (!ident.equals(other.ident))
            return false;
        return true;
    }