| // Copyright 2012 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. |
| |
| // ignore-compare-mode-nll |
| |
| // Illustrates the "projection gap": in this test, even though we know |
| // that `T::Foo: 'x`, that does not tell us that `T: 'x`, because |
| // there might be other ways for the caller of `func` to show that |
| // `T::Foo: 'x` holds (e.g., where-clause). |
| |
| trait Trait1<'x> { |
| type Foo; |
| } |
| |
| // calling this fn should trigger a check that the type argument |
| // supplied is well-formed. |
| fn wf<T>() { } |
| |
| fn func<'x, T:Trait1<'x>>(t: &'x T::Foo) |
| { |
| wf::<&'x T>(); |
| //~^ ERROR the parameter type `T` may not live long enough |
| } |
| |
| fn caller2<'x, T:Trait1<'x>>(t: &'x T) |
| { |
| wf::<&'x T::Foo>(); // OK |
| } |
| |
| fn caller3<'x, T:Trait1<'x>>(t: &'x T::Foo) |
| { |
| wf::<&'x T::Foo>(); // OK |
| } |
| |
| fn main() { } |