41 lines
1.3 KiB
Rust
41 lines
1.3 KiB
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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// compile-pass
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#![allow(dead_code)]
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// Regression test for #41936. The coerce-unsized trait check in
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// coherence was using subtyping, which triggered variance
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// computation, which failed because it required type info for fields
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// that had not (yet) been computed.
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#![feature(unsize)]
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#![feature(coerce_unsized)]
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use std::{marker,ops};
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// Change the array to a non-array, and error disappears
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// Adding a new field to the end keeps the error
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struct LogDataBuf([u8;8]);
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struct Aref<T: ?Sized>
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{
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// Inner structure triggers the error, removing the inner removes the message.
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ptr: Box<ArefInner<T>>,
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}
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impl<T: ?Sized + marker::Unsize<U>, U: ?Sized> ops::CoerceUnsized<Aref<U>> for Aref<T> {}
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struct ArefInner<T: ?Sized>
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{
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// Even with this field commented out, the error is raised.
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data: T,
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}
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fn main(){}
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