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.
47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
// Copyright 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 attempts to implicitly coerce a value into an
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// object respect the lifetime bound on the object type.
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trait Foo : ::std::marker::MarkerTrait {}
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impl<'a> Foo for &'a [u8] {}
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// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
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fn a(v: &[u8]) -> Box<Foo + 'static> {
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let x: Box<Foo + 'static> = Box::new(v);
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//~^ ERROR cannot infer an appropriate lifetime due to conflicting
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x
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}
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fn b(v: &[u8]) -> Box<Foo + 'static> {
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Box::new(v)
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//~^ ERROR cannot infer an appropriate lifetime due to conflicting
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}
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fn c(v: &[u8]) -> Box<Foo> {
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// same as previous case due to RFC 599
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Box::new(v)
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//~^ ERROR cannot infer an appropriate lifetime due to conflicting
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}
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fn d<'a,'b>(v: &'a [u8]) -> Box<Foo+'b> {
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Box::new(v)
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//~^ ERROR cannot infer an appropriate lifetime due to conflicting
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}
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fn e<'a:'b,'b>(v: &'a [u8]) -> Box<Foo+'b> {
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Box::new(v) // OK, thanks to 'a:'b
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}
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fn main() { }
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