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simple_clause!(NoOrderClause, OrderClause, " ORDER BY "); impl<'a, DB, Expr> Into<Option<Box<dyn QueryFragment<DB> + 'a>>> for OrderClause<Expr> where DB: Backend, Expr: QueryFragment<DB> + 'a, { fn into(self) -> Option<Box<dyn QueryFragment<DB> + 'a>> { Some(Box::new(self.0)) } } impl<'a, DB> Into<Option<Box<dyn QueryFragment<DB> + 'a>>> for NoOrderClause where DB: Backend, { fn into(self) -> Option<Box<dyn QueryFragment<DB> + 'a>> { None } }