src/test/compile-fail/isssue-38821.rs

   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.
   4 //
   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.
  10
  11 pub struct Nullable<T: NotNull>(T);
  12
  13 pub trait NotNull {}
  14
  15 pub trait IntoNullable {
  16     type Nullable;
  17 }
  18
  19 impl<T: NotNull> IntoNullable for T {
  20     type Nullable = Nullable<T>;
  21 }
  22
  23 impl<T: NotNull> IntoNullable for Nullable<T> {
  24     type Nullable = Nullable<T>;
  25 }
  26
  27 pub trait Expression {
  28     type SqlType;
  29 }
  30
  31 pub trait Column: Expression {}
  32
  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
  36     Col: Column,
  37     Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
  38 {
  39     Expression(Col, Expr),
  40     Default(Col),
  41 }
  42
  43 fn main() {}