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