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1 | // Copyright 2015 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 | // check that static methods don't get to assume their trait-ref | |
12 | // is well-formed. | |
13 | // FIXME(#27579): this is just a bug. However, our checking with | |
14 | // static inherent methods isn't quite working - need to | |
15 | // fix that before removing the check. | |
16 | ||
17 | trait Foo<'a, 'b, T>: Sized { | |
18 | fn make_me() -> Self { loop {} } | |
19 | fn static_evil(u: &'b u32) -> &'a u32; | |
20 | } | |
21 | ||
22 | struct Evil<'a, 'b: 'a>(Option<&'a &'b ()>); | |
23 | ||
24 | impl<'a, 'b> Foo<'a, 'b, Evil<'a, 'b>> for () { | |
25 | fn make_me() -> Self { } | |
26 | fn static_evil(u: &'b u32) -> &'a u32 { | |
54a0048b | 27 | u //~ ERROR E0312 |
b039eaaf SL |
28 | } |
29 | } | |
30 | ||
31 | struct IndirectEvil<'a, 'b: 'a>(Option<&'a &'b ()>); | |
32 | ||
33 | impl<'a, 'b> Foo<'a, 'b, ()> for IndirectEvil<'a, 'b> { | |
34 | fn make_me() -> Self { IndirectEvil(None) } | |
35 | fn static_evil(u: &'b u32) -> &'a u32 { | |
36 | let me = Self::make_me(); //~ ERROR lifetime bound not satisfied | |
37 | loop {} // (`me` could be used for the lifetime transmute). | |
38 | } | |
39 | } | |
40 | ||
41 | impl<'a, 'b> Evil<'a, 'b> { | |
42 | fn inherent_evil(u: &'b u32) -> &'a u32 { | |
54a0048b | 43 | u //~ ERROR E0312 |
b039eaaf SL |
44 | } |
45 | } | |
46 | ||
47 | // while static methods don't get to *assume* this, we still | |
48 | // *check* that they hold. | |
49 | ||
50 | fn evil<'a, 'b>(b: &'b u32) -> &'a u32 { | |
51 | <()>::static_evil(b) //~ ERROR cannot infer an appropriate lifetime | |
52 | } | |
53 | ||
54 | fn indirect_evil<'a, 'b>(b: &'b u32) -> &'a u32 { | |
55 | <IndirectEvil>::static_evil(b) | |
56 | //~^ ERROR cannot infer an appropriate lifetime | |
57 | } | |
58 | ||
59 | fn inherent_evil<'a, 'b>(b: &'b u32) -> &'a u32 { | |
60 | <Evil>::inherent_evil(b) // bug? shouldn't this be an error | |
61 | } | |
62 | ||
63 | ||
64 | fn main() {} |