29 lines
926 B
Rust
29 lines
926 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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// ignore-tidy-linelength
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#![feature(coerce_unsized)]
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use std::ops::CoerceUnsized;
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struct Foo<T: ?Sized, U: ?Sized> {
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a: i32,
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b: T,
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c: U,
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}
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impl<T, U> CoerceUnsized<Foo<U, T>> for Foo<T, U> {}
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//~^ ERROR E0375
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//~| NOTE requires multiple coercions
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//~| NOTE `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced
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//~| NOTE currently, 2 fields need coercions: b (T to U), c (U to T)
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fn main() {}
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