| // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| #![feature(specialization)] |
| |
| trait Foo: Copy + ToString {} |
| |
| impl<T: Copy + ToString> Foo for T {} |
| |
| fn hide<T: Foo>(x: T) -> impl Foo { |
| x |
| } |
| |
| fn two(x: bool) -> impl Foo { |
| if x { |
| return 1_i32; |
| } |
| 0_u32 |
| //~^ ERROR mismatched types |
| //~| expected i32, found u32 |
| } |
| |
| fn sum_to(n: u32) -> impl Foo { |
| if n == 0 { |
| 0 |
| } else { |
| n + sum_to(n - 1) |
| //~^ ERROR cannot add `impl Foo` to `u32` |
| } |
| } |
| |
| trait Leak: Sized { |
| type T; |
| fn leak(self) -> Self::T; |
| } |
| impl<T> Leak for T { |
| default type T = (); |
| default fn leak(self) -> Self::T { panic!() } |
| } |
| impl Leak for i32 { |
| type T = i32; |
| fn leak(self) -> i32 { self } |
| } |
| |
| fn main() { |
| } |