src/test/run-pass/impl-trait/universal_in_adt_in_parameters.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 #![feature(universal_impl_trait)]
  12 use std::fmt::Display;
  13
  14 fn check_display_eq(iter: &Vec<impl Display>) {
  15     let mut collected = String::new();
  16     for it in iter {
  17         let disp = format!("{} ", it);
  18         collected.push_str(&disp);
  19     }
  20     assert_eq!("0 3 27 823 4891 1 0", collected.trim());
  21 }
  22
  23 fn main() {
  24     let i32_list_vec = vec![0i32, 3, 27, 823, 4891, 1, 0];
  25     let u32_list_vec = vec![0u32, 3, 27, 823, 4891, 1, 0];
  26     let str_list_vec = vec!["0", "3", "27", "823", "4891", "1", "0"];
  27
  28     check_display_eq(&i32_list_vec);
  29     check_display_eq(&u32_list_vec);
  30     check_display_eq(&str_list_vec);
  31 }