46 lines
1.2 KiB
Rust
46 lines
1.2 KiB
Rust
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// Copyright 2015 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 various cases where the defaults should lead to errors being
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// reported.
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#![allow(dead_code)]
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trait SomeTrait {
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fn dummy(&self) { }
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}
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struct SomeStruct<'a> {
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r: Box<SomeTrait+'a>
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}
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fn load(ss: &mut SomeStruct) -> Box<SomeTrait> {
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// `Box<SomeTrait>` defaults to a `'static` bound, so this return
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// is illegal.
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ss.r //~ ERROR mismatched types
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}
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fn store(ss: &mut SomeStruct, b: Box<SomeTrait>) {
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// No error: b is bounded by 'static which outlives the
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// (anonymous) lifetime on the struct.
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ss.r = b;
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}
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fn store1<'b>(ss: &mut SomeStruct, b: Box<SomeTrait+'b>) {
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// Here we override the lifetimes explicitly, and so naturally we get an error.
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ss.r = b; //~ ERROR mismatched types
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}
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fn main() {
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}
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