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implement 'a:'static region bounds

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Fixes #22863.
This commit is contained in:
Ariel Ben-Yehuda 2015-07-06 20:40:12 +03:00 • committed by Ariel Ben-Yehuda
parent e05ac3938b
commit 34309cdf12
4 changed files with 77 additions and 8 deletions
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24
src/test/compile-fail/regions-static-bound.rs Normal file
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
fn static_id<'a,'b>(t: &'a ()) -> &'static ()
where 'a: 'static { t }
fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
where 'a: 'b, 'b: 'static { t }
fn static_id_wrong_way<'a>(t: &'a ()) -> &'static () where 'static: 'a {
t //~ ERROR cannot infer an appropriate lifetime
}
fn error(u: &(), v: &()) {
static_id(&u); //~ ERROR cannot infer an appropriate lifetime
static_id_indirect(&v); //~ ERROR cannot infer an appropriate lifetime
}
fn main() {}

28
src/test/run-pass/regions-static-bound.rs Normal file
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
fn invariant_id<'a,'b>(t: &'b mut &'static ()) -> &'b mut &'a ()
where 'a: 'static { t }
fn static_id<'a>(t: &'a ()) -> &'static ()
where 'a: 'static { t }
fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
where 'a: 'b, 'b: 'static { t }
fn ref_id<'a>(t: &'a ()) -> &'a () where 'static: 'a { t }
static UNIT: () = ();
fn main()
{
let mut val : &'static () = &UNIT;
invariant_id(&mut val);
static_id(val);
static_id_indirect(val);
ref_id(val);
}