939bb32883
In intercrate mode, if we determine that a particular `T: Trait` is unknowable, we sometimes also go and get extra causal information. An errant `?` was causing us to propagate an error found in that process out as if `T: Trait` was not unknowable but rather not provable. This led to an ICE.
23 lines
812 B
Rust
23 lines
812 B
Rust
// Copyright 2015 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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// Regression test for #48728, an ICE that occurred computing
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// coherence "help" information.
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#[derive(Clone)] //~ ERROR conflicting implementations of trait `std::clone::Clone`
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struct Node<T: ?Sized>(Box<T>);
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impl<T: Clone + ?Sized> Clone for Node<[T]> {
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fn clone(&self) -> Self {
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Node(Box::clone(&self.0))
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}
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}
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fn main() {}
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