4aca540018
This patch allows overlap to occur between any two impls of a trait for traits which have no associated items. Several compile-fail tests around coherence had to be changed to add at least one item to the trait they test against. Ref #29864
29 lines
895 B
Rust
29 lines
895 B
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(rustc_attrs)]
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// Here we expect a coherence conflict because, even though `i32` does
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// not implement `Iterator`, we cannot rely on that negative reasoning
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// due to the orphan rules. Therefore, `A::Item` may yet turn out to
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// be `i32`.
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pub trait Foo<P> { fn foo() {} }
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pub trait Bar {
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type Output: 'static;
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}
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impl Foo<i32> for i32 { }
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impl<A:Iterator> Foo<A::Item> for A { } //~ ERROR E0119
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fn main() {}
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