1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 pub struct Nullable<T: NotNull>(T);
15 pub trait IntoNullable {
19 impl<T: NotNull> IntoNullable for T {
20 type Nullable = Nullable<T>;
23 impl<T: NotNull> IntoNullable for Nullable<T> {
24 type Nullable = Nullable<T>;
27 pub trait Expression {
31 pub trait Column: Expression {}
33 #[derive(Debug, Copy, Clone)]
34 //~^ ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
35 pub enum ColumnInsertValue<Col, Expr> where
37 Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
39 Expression(Col, Expr),