rust/src/test/compile-fail/region-object-lifetime-4.rs

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// Copyright 2012-2014 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.
// Various tests related to testing how region inference works
// with respect to the object receivers.
trait Foo {
fn borrowed<'a>(&'a self) -> &'a ();
}
// Here we have two distinct lifetimes, but we try to return a pointer
// with the longer lifetime when (from the signature) we only know
// that it lives as long as the shorter lifetime. Therefore, error.
fn borrowed_receiver_related_lifetimes2<'a,'b>(x: &'a (Foo+'b)) -> &'b () {
x.borrowed() //~ ERROR cannot infer
}
fn main() {}