| // 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. |
| |
| // Test that if a struct declares multiple region bounds for a given |
| // type parameter, an explicit lifetime bound is required on object |
| // lifetimes within. |
| |
| #![allow(dead_code)] |
| |
| trait Test { |
| fn foo(&self) { } |
| } |
| |
| struct Ref0<T:?Sized> { |
| r: *mut T |
| } |
| |
| struct Ref1<'a,T:'a+?Sized> { |
| r: &'a T |
| } |
| |
| struct Ref2<'a,'b:'a,T:'a+'b+?Sized> { |
| r: &'a &'b T |
| } |
| |
| fn a<'a,'b>(t: Ref2<'a,'b,Test>) { |
| //~^ ERROR lifetime bound for this object type cannot be deduced from context |
| } |
| |
| fn b(t: Ref2<Test>) { |
| //~^ ERROR lifetime bound for this object type cannot be deduced from context |
| } |
| |
| fn c(t: Ref2<&Test>) { |
| // In this case, the &'a overrides. |
| } |
| |
| fn d(t: Ref2<Ref1<Test>>) { |
| // In this case, the lifetime parameter from the Ref1 overrides. |
| } |
| |
| fn e(t: Ref2<Ref0<Test>>) { |
| // In this case, Ref2 is ambiguous, but Ref0 overrides with 'static. |
| } |
| |
| fn f(t: &Ref2<Test>) { |
| //~^ ERROR lifetime bound for this object type cannot be deduced from context |
| } |
| |
| fn main() { |
| } |