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[rustc.git] / src / test / compile-fail / on-unimplemented.rs
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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.
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// ignore-tidy-linelength
11
12#![feature(on_unimplemented)]
13
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14#[rustc_on_unimplemented = "test error `{Self}` with `{Bar}` `{Baz}` `{Quux}`"]
15trait Foo<Bar, Baz, Quux>
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16{}
17
18fn foobar<U: Clone, T: Foo<u8, U, u32>>() -> T {
19
20}
21
22#[rustc_on_unimplemented="a collection of type `{Self}` cannot be built from an iterator over elements of type `{A}`"]
23trait MyFromIterator<A> {
24 /// Build a container with elements from an external iterator.
25 fn my_from_iter<T: Iterator<Item=A>>(iterator: T) -> Self;
26}
27
28fn collect<A, I: Iterator<Item=A>, B: MyFromIterator<A>>(it: I) -> B {
29 MyFromIterator::my_from_iter(it)
30}
31
32pub fn main() {
33 let x = vec!(1u8, 2, 3, 4);
34 let y: Option<Vec<u8>> = collect(x.iter()); // this should give approximately the same error for x.iter().collect()
35 //~^ ERROR
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36 //~^^ NOTE a collection of type `std::option::Option<std::vec::Vec<u8>>` cannot be built from an iterator over elements of type `&u8`
37 //~^^^ NOTE required by `collect`
85aaf69f 38 let x: String = foobar(); //~ ERROR
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39 //~^ NOTE test error `std::string::String` with `u8` `_` `u32`
40 //~^^ NOTE required by `foobar`
85aaf69f 41}