src/test/compile-fail/reflect.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(reflect_marker)]
  12
  13 // Test that there is no way to get a generic type `T` to be
  14 // considered as `Reflect` (or accessible via something that is
  15 // considered `Reflect`) without a reflect bound, but that any
  16 // concrete type works fine. Note that object types are tested
  17 // separately.
  18
  19 use std::marker::Reflect;
  20 use std::io::Write;
  21
  22 struct Struct<T>(T);
  23
  24 fn is_reflect<T:Reflect>() { }
  25
  26 fn c<T>() {
  27     is_reflect::<Struct<T>>(); //~ ERROR E0277
  28 }
  29
  30 fn ok_c<T: Reflect>() {
  31     is_reflect::<Struct<T>>(); // OK
  32 }
  33
  34 fn d<T>() {
  35     is_reflect::<(i32, T)>(); //~ ERROR E0277
  36 }
  37
  38 fn main() {
  39     is_reflect::<&i32>(); // OK
  40     is_reflect::<Box<Write>>(); // OK
  41 }