def render(self, r):
    return '(InsertFields {} {})'.format(self.old, ' '.join(['({} {})'.format(escape_id(f), r(x)) for (f, x) in self.fields]))
def render(self, r):
    return '(InsertFields {} {})'.format(self.old, ' '.join(['({} {})'.format(escape_id(f), r(x)) for (f, x) in self.fields]))