| // Copyright 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. |
| |
| // Check that explicit region bounds are allowed on the various |
| // nominal types (but not on other types) and that they are type |
| // checked. |
| |
| struct Inv<'a> { // invariant w/r/t 'a |
| x: &'a mut &'a isize |
| } |
| |
| pub trait Foo<'a, 't> { |
| fn no_bound<'b>(self, b: Inv<'b>); |
| fn has_bound<'b:'a>(self, b: Inv<'b>); |
| fn wrong_bound1<'b,'c,'d:'a+'b>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>); |
| fn okay_bound<'b,'c,'d:'a+'b+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>); |
| fn another_bound<'x: 'a>(self, x: Inv<'x>, y: Inv<'t>); |
| } |
| |
| impl<'a, 't> Foo<'a, 't> for &'a isize { |
| fn no_bound<'b:'a>(self, b: Inv<'b>) { |
| //~^ ERROR lifetime parameters or bounds on method `no_bound` do not match |
| } |
| |
| fn has_bound<'b>(self, b: Inv<'b>) { |
| //~^ ERROR lifetime parameters or bounds on method `has_bound` do not match |
| } |
| |
| fn wrong_bound1<'b,'c,'d:'a+'c>(self, b: Inv<'b>, c: Inv<'c>, d: Inv<'d>) { |
| //~^ ERROR method `wrong_bound1` has an incompatible type for trait |
| // |
| // Note: This is a terrible error message. It is caused |
| // because, in the trait, 'b is early bound, and in the impl, |
| // 'c is early bound, so -- after substitution -- the |
| // lifetimes themselves look isomorphic. We fail because the |
| // lifetimes that appear in the types are in the wrong |
| // order. This should really be fixed by keeping more |
| // information about the lifetime declarations in the trait so |
| // that we can compare better to the impl, even in cross-crate |
| // cases. |
| } |
| |
| fn okay_bound<'b,'c,'e:'b+'c>(self, b: Inv<'b>, c: Inv<'c>, e: Inv<'e>) { |
| } |
| |
| fn another_bound<'x: 't>(self, x: Inv<'x>, y: Inv<'t>) { |
| //~^ ERROR lifetime bound not satisfied |
| } |
| } |
| |
| fn main() { } |