0d5bcb14ad
Many of the modifications putting in `Box::new` calls also include a pointer to Issue 22405, which tracks going back to `box <expr>` if possible in the future. (Still tried to use `Box<_>` where it sufficed; thus some tests still have `box_syntax` enabled, as they use a mix of `box` and `Box::new`.) Precursor for overloaded-`box` and placement-`in`; see Issue 22181.
28 lines
1022 B
Rust
28 lines
1022 B
Rust
// Copyright 2012-2013-2014 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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// Test that cross-borrowing (implicitly converting from `Box<T>` to `&T`) is
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// forbidden when `T` is a trait.
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struct Foo;
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trait Trait { fn foo(&self) {} }
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impl Trait for Foo {}
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pub fn main() {
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// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
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let x: Box<Trait> = Box::new(Foo);
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let _y: &Trait = x; //~ ERROR mismatched types
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//~| expected `&Trait`
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//~| found `Box<Trait>`
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//~| expected &-ptr
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//~| found box
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}
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