mirror of https://github.com/rust-lang/rust
33 lines
894 B
Rust
33 lines
894 B
Rust
// ignore-tidy-linelength
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#![feature(rustc_attrs)]
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pub mod Bar {
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#[rustc_on_unimplemented = "test error `{Self}` with `{Bar}` `{Baz}` `{Quux}` in `{Foo}`"]
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pub trait Foo<Bar, Baz, Quux> {}
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}
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use Bar::Foo;
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fn foobar<U: Clone, T: Foo<u8, U, u32>>() -> T {
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panic!()
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}
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#[rustc_on_unimplemented="a collection of type `{Self}` cannot be built from an iterator over elements of type `{A}`"]
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trait MyFromIterator<A> {
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/// Builds a container with elements from an external iterator.
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fn my_from_iter<T: Iterator<Item=A>>(iterator: T) -> Self;
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}
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fn collect<A, I: Iterator<Item=A>, B: MyFromIterator<A>>(it: I) -> B {
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MyFromIterator::my_from_iter(it)
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}
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pub fn main() {
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let x = vec![1u8, 2, 3, 4];
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let y: Option<Vec<u8>> = collect(x.iter()); // this should give approximately the same error for x.iter().collect()
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//~^ ERROR
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let x: String = foobar(); //~ ERROR
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}
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