70 lines
2.8 KiB
Rust
70 lines
2.8 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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use std::mem;
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struct Misc<T:?Sized>(T);
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fn check<T: Iterator, U: ?Sized>() {
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// suggest a where-clause, if needed
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mem::size_of::<U>();
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//~^ ERROR `U: std::marker::Sized` is not satisfied
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//~| HELP consider adding a `where U: std::marker::Sized` bound
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//~| NOTE required by `std::mem::size_of`
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//~| NOTE `U` does not have a constant size known at compile-time
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//~| HELP the trait `std::marker::Sized` is not implemented for `U`
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mem::size_of::<Misc<U>>();
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//~^ ERROR `U: std::marker::Sized` is not satisfied
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//~| HELP consider adding a `where U: std::marker::Sized` bound
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//~| NOTE required because it appears within the type `Misc<U>`
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//~| NOTE required by `std::mem::size_of`
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//~| NOTE `U` does not have a constant size known at compile-time
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//~| HELP within `Misc<U>`, the trait `std::marker::Sized` is not implemented for `U`
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// ... even if T occurs as a type parameter
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<u64 as From<T>>::from;
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//~^ ERROR `u64: std::convert::From<T>` is not satisfied
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//~| HELP consider adding a `where u64: std::convert::From<T>` bound
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//~| NOTE required by `std::convert::From::from`
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//~| NOTE the trait `std::convert::From<T>` is not implemented for `u64`
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<u64 as From<<T as Iterator>::Item>>::from;
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//~^ ERROR `u64: std::convert::From<<T as std::iter::Iterator>::Item>` is not satisfied
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//~| HELP consider adding a `where u64:
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//~| NOTE required by `std::convert::From::from`
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//~| NOTE the trait `std::convert::From<<T as std::iter::Iterator>::Item>` is not implemented
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// ... but not if there are inference variables
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<Misc<_> as From<T>>::from;
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//~^ ERROR `Misc<_>: std::convert::From<T>` is not satisfied
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//~| NOTE required by `std::convert::From::from`
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//~| NOTE the trait `std::convert::From<T>` is not implemented for `Misc<_>`
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// ... and also not if the error is not related to the type
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mem::size_of::<[T]>();
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//~^ ERROR `[T]: std::marker::Sized` is not satisfied
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//~| NOTE `[T]` does not have a constant size
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//~| NOTE required by `std::mem::size_of`
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//~| HELP the trait `std::marker::Sized` is not implemented for `[T]`
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mem::size_of::<[&U]>();
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//~^ ERROR `[&U]: std::marker::Sized` is not satisfied
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//~| NOTE `[&U]` does not have a constant size
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//~| NOTE required by `std::mem::size_of`
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//~| HELP the trait `std::marker::Sized` is not implemented for `[&U]`
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}
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fn main() {
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}
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