src/test/run-pass/issue-24972.rs

   1 // Copyright 2015 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 #![feature(rustc_private)]
  12
  13 extern crate serialize;
  14
  15 use serialize::{Encodable, Decodable};
  16 use std::fmt::Display;
  17
  18 pub trait Entity : Decodable + Encodable + Sized {
  19     type Key: Clone + Decodable + Encodable + ToString + Display + Eq + Ord + Sized;
  20
  21     fn id(&self) -> Self::Key;
  22
  23     fn find_by_id(id: Self::Key) -> Option<Self>;
  24 }
  25
  26 pub struct DbRef<E: Entity> {
  27     pub id: E::Key,
  28 }
  29
  30 impl<E> DbRef<E> where E: Entity {
  31     fn get(self) -> Option<E> {
  32         E::find_by_id(self.id)
  33     }
  34 }
  35
  36 fn main() {}