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1 | // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | fn a<'a, 'b, 'c>(x: &mut &'a isize, y: &mut &'b isize, z: &mut &'c isize) where 'b: 'a + 'c { | |
12 | // Note: this is legal because of the `'b:'a` declaration. | |
13 | *x = *y; | |
14 | *z = *y; | |
15 | } | |
16 | ||
17 | fn b<'a, 'b, 'c>(x: &mut &'a isize, y: &mut &'b isize, z: &mut &'c isize) { | |
18 | // Illegal now because there is no `'b:'a` declaration. | |
54a0048b SL |
19 | *x = *y; //~ ERROR E0312 |
20 | *z = *y; //~ ERROR E0312 | |
1a4d82fc JJ |
21 | } |
22 | ||
23 | fn c<'a,'b, 'c>(x: &mut &'a isize, y: &mut &'b isize, z: &mut &'c isize) { | |
24 | // Here we try to call `foo` but do not know that `'a` and `'b` are | |
25 | // related as required. | |
26 | a(x, y, z); //~ ERROR cannot infer | |
27 | } | |
28 | ||
29 | fn d() { | |
30 | // 'a and 'b are early bound in the function `a` because they appear | |
31 | // inconstraints: | |
32 | let _: fn(&mut &isize, &mut &isize, &mut &isize) = a; //~ ERROR mismatched types | |
33 | } | |
34 | ||
35 | fn e() { | |
36 | // 'a and 'b are late bound in the function `b` because there are | |
37 | // no constraints: | |
38 | let _: fn(&mut &isize, &mut &isize, &mut &isize) = b; | |
39 | } | |
40 | ||
41 | fn main() { } |