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