rust/src/test/compile-fail/regions-bounds.rs

// 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.

// Check that explicit region bounds are allowed on the various
// nominal types (but not on other types) and that they are type
// checked.

enum an_enum = &'self int;
trait a_trait {
    fn foo() -> &'self int;
}
struct a_class { x:&'self int }

fn a_fn1(e: an_enum<'a>) -> an_enum<'b> {
    return e; //~ ERROR mismatched types: expected `an_enum/&b` but found `an_enum/&a`
}

fn a_fn2(e: a_trait<'a>) -> a_trait<'b> {
    return e; //~ ERROR mismatched types: expected `@a_trait/&b` but found `@a_trait/&a`
}

fn a_fn3(e: a_class<'a>) -> a_class<'b> {
    return e; //~ ERROR mismatched types: expected `a_class/&b` but found `a_class/&a`
}

fn a_fn4(e: int<'a>) -> int<'b> {
    //~^ ERROR region parameters are not allowed on this type
    //~^^ ERROR region parameters are not allowed on this type
    return e;
}

fn main() { }