| // Copyright 2014 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. |
| // ignore-tidy-linelength |
| |
| #![feature(on_unimplemented)] |
| |
| #[rustc_on_unimplemented = "test error `{Self}` with `{Bar}` `{Baz}` `{Quux}`"] |
| trait Foo<Bar, Baz, Quux> |
| {} |
| |
| fn foobar<U: Clone, T: Foo<u8, U, u32>>() -> T { |
| |
| } |
| |
| #[rustc_on_unimplemented="a collection of type `{Self}` cannot be built from an iterator over elements of type `{A}`"] |
| trait MyFromIterator<A> { |
| /// Build a container with elements from an external iterator. |
| fn my_from_iter<T: Iterator<Item=A>>(iterator: T) -> Self; |
| } |
| |
| fn collect<A, I: Iterator<Item=A>, B: MyFromIterator<A>>(it: I) -> B { |
| MyFromIterator::my_from_iter(it) |
| } |
| |
| pub fn main() { |
| let x = vec!(1u8, 2, 3, 4); |
| let y: Option<Vec<u8>> = collect(x.iter()); // this should give approximately the same error for x.iter().collect() |
| //~^ ERROR |
| //~^^ NOTE a collection of type `core::option::Option<collections::vec::Vec<u8>>` cannot be built from an iterator over elements of type `&u8` |
| let x: String = foobar(); //~ ERROR |
| //~^ NOTE test error `collections::string::String` with `u8` `_` `u32` |
| } |