| // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // compile-pass |
| #![allow(dead_code)] |
| // Regression test for #41936. The coerce-unsized trait check in |
| // coherence was using subtyping, which triggered variance |
| // computation, which failed because it required type info for fields |
| // that had not (yet) been computed. |
| |
| #![feature(unsize)] |
| #![feature(coerce_unsized)] |
| |
| use std::{marker,ops}; |
| |
| // Change the array to a non-array, and error disappears |
| // Adding a new field to the end keeps the error |
| struct LogDataBuf([u8;8]); |
| |
| struct Aref<T: ?Sized> |
| { |
| // Inner structure triggers the error, removing the inner removes the message. |
| ptr: Box<ArefInner<T>>, |
| } |
| impl<T: ?Sized + marker::Unsize<U>, U: ?Sized> ops::CoerceUnsized<Aref<U>> for Aref<T> {} |
| |
| struct ArefInner<T: ?Sized> |
| { |
| // Even with this field commented out, the error is raised. |
| data: T, |
| } |
| |
| fn main(){} |
