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Add test cases for cyclic specialization graph construction
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// Copyright 2017 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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// Formerly this ICEd with the following message:
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// Tried to project an inherited associated type during coherence checking,
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// which is currently not supported.
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//
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// No we expect to run into a more user-friendly cycle error instead.
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#![feature(specialization)]
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trait Trait<T> { type Assoc; }
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//~^ unsupported cyclic reference between types/traits detected [E0391]
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impl<T> Trait<T> for Vec<T> {
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type Assoc = ();
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}
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impl Trait<u8> for Vec<u8> {}
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impl<T> Trait<T> for String {
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type Assoc = ();
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}
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impl Trait<<Vec<u8> as Trait<u8>>::Assoc> for String {}
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fn main() {}
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// Copyright 2017 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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// Make sure we don't crash with a cycle error during coherence.
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#![feature(specialization)]
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trait Trait<T> {
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type Assoc;
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}
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impl<T> Trait<T> for Vec<T> {
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default type Assoc = ();
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}
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impl Trait<u8> for Vec<u8> {
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type Assoc = u8;
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}
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impl<T> Trait<T> for String {
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type Assoc = ();
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}
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impl Trait<<Vec<u8> as Trait<u8>>::Assoc> for String {}
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fn main() {}

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