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1 | // Copyright 2012-2014 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 | // The regression test for #15031 to make sure destructuring trait | |
12 | // reference work properly. | |
13 | ||
85aaf69f | 14 | #![feature(box_patterns)] |
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15 | #![feature(box_syntax)] |
16 | ||
85aaf69f | 17 | trait T { fn foo(&self) {} } |
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18 | impl T for isize {} |
19 | ||
20 | fn main() { | |
21 | // For an expression of the form: | |
22 | // | |
23 | // let &...&x = &..&SomeTrait; | |
24 | // | |
25 | // Say we have n `&` at the left hand and m `&` right hand, then: | |
26 | // if n < m, we are golden; | |
27 | // if n == m, it's a derefing non-derefable type error; | |
28 | // if n > m, it's a type mismatch error. | |
29 | ||
30 | // n < m | |
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31 | let &x = &(&1isize as &T); |
32 | let &x = &&(&1isize as &T); | |
33 | let &&x = &&(&1isize as &T); | |
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34 | |
35 | // n == m | |
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36 | let &x = &1isize as &T; //~ ERROR type `&T` cannot be dereferenced |
37 | let &&x = &(&1isize as &T); //~ ERROR type `&T` cannot be dereferenced | |
54a0048b | 38 | let box x = box 1isize as Box<T>; //~ ERROR `T: std::marker::Sized` is not satisfied |
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39 | |
40 | // n > m | |
62682a34 | 41 | let &&x = &1isize as &T; |
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42 | //~^ ERROR mismatched types |
43 | //~| expected `T` | |
44 | //~| found `&_` | |
45 | //~| expected trait T | |
46 | //~| found &-ptr | |
62682a34 | 47 | let &&&x = &(&1isize as &T); |
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48 | //~^ ERROR mismatched types |
49 | //~| expected `T` | |
50 | //~| found `&_` | |
51 | //~| expected trait T | |
52 | //~| found &-ptr | |
62682a34 | 53 | let box box x = box 1isize as Box<T>; |
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54 | //~^ ERROR mismatched types |
55 | //~| expected `T` | |
56 | //~| found `Box<_>` | |
57 | //~| expected trait T | |
58 | //~| found box | |
1a4d82fc | 59 | } |