44 lines
1.3 KiB
Rust
44 lines
1.3 KiB
Rust
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// 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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#![feature(conservative_impl_trait)]
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// Helper creating a fake borrow, captured by the impl Trait.
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fn borrow<'a, T>(_: &'a mut T) -> impl Copy { () }
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fn stack() -> impl Copy {
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//~^ ERROR only named lifetimes are allowed in `impl Trait`
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let x = 0;
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&x
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}
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fn late_bound(x: &i32) -> impl Copy {
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//~^ ERROR only named lifetimes are allowed in `impl Trait`
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x
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}
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// FIXME(#34511) Should work but doesn't at the moment,
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// region-checking needs an overhault to support this.
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fn early_bound<'a>(x: &'a i32) -> impl Copy {
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//~^ ERROR only named lifetimes are allowed in `impl Trait`
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x
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}
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fn ambiguous<'a, 'b>(x: &'a [u32], y: &'b [u32]) -> impl Iterator<Item=u32> {
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//~^ ERROR only named lifetimes are allowed in `impl Trait`
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if x.len() < y.len() {
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x.iter().cloned()
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} else {
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y.iter().cloned()
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}
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}
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fn main() {}
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