1 // Copyright 2016 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 #![feature(conservative_impl_trait, specialization)]
13 trait Foo: Copy + ToString {}
15 impl<T: Copy + ToString> Foo for T {}
17 fn hide<T: Foo>(x: T) -> impl Foo {
21 fn two(x: bool) -> impl Foo {
26 //~^ ERROR mismatched types
27 //~| expected i32, found u32
30 fn sum_to(n: u32) -> impl Foo {
35 //~^ ERROR the trait bound `u32: std::ops::Add<impl Foo>` is not satisfied
41 fn leak(self) -> Self::T;
45 default fn leak(self) -> Self::T { panic!() }
49 fn leak(self) -> i32 { self }
53 let _: u32 = hide(0_u32);
54 //~^ ERROR mismatched types
55 //~| expected type `u32`
56 //~| found type `impl Foo`
57 //~| expected u32, found anonymized type
59 let _: i32 = Leak::leak(hide(0_i32));
60 //~^ ERROR mismatched types
61 //~| expected type `i32`
62 //~| found type `<impl Foo as Leak>::T`
63 //~| expected i32, found associated type
65 let mut x = (hide(0_u32), hide(0_i32));
67 //~^ ERROR mismatched types
68 //~| expected u32, found i32
70 //~^ ERROR mismatched types
71 //~| expected i32, found u32