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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
),