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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 | // Test a case of a trait which extends the same supertrait twice, but | |
12 | // with difference type parameters. Test then that when we don't give | |
13 | // enough information to pick between these, no selection is made. In | |
14 | // this particular case, the two choices are i64/u64 -- so when we use | |
15 | // an integer literal, we wind up falling this literal back to i32. | |
16 | // See also `run-pass/trait-repeated-supertrait.rs`. | |
17 | ||
18 | trait CompareTo<T> { | |
19 | fn same_as(&self, t: T) -> bool; | |
20 | } | |
21 | ||
22 | trait CompareToInts : CompareTo<i64> + CompareTo<u64> { | |
23 | } | |
24 | ||
25 | impl CompareTo<i64> for i64 { | |
26 | fn same_as(&self, t: i64) -> bool { *self == t } | |
27 | } | |
28 | ||
29 | impl CompareTo<u64> for i64 { | |
30 | fn same_as(&self, t: u64) -> bool { *self == (t as i64) } | |
31 | } | |
32 | ||
33 | impl CompareToInts for i64 { } | |
34 | ||
35 | fn with_obj(c: &CompareToInts) -> bool { | |
54a0048b | 36 | c.same_as(22) //~ ERROR `CompareToInts: CompareTo<i32>` is not satisfied |
c34b1796 AL |
37 | } |
38 | ||
39 | fn with_trait<C:CompareToInts>(c: &C) -> bool { | |
54a0048b | 40 | c.same_as(22) //~ ERROR `C: CompareTo<i32>` is not satisfied |
c34b1796 AL |
41 | } |
42 | ||
43 | fn with_ufcs1<C:CompareToInts>(c: &C) -> bool { | |
54a0048b | 44 | CompareToInts::same_as(c, 22) //~ ERROR `CompareToInts: CompareTo<i32>` is not satisfied |
c34b1796 AL |
45 | } |
46 | ||
47 | fn with_ufcs2<C:CompareToInts>(c: &C) -> bool { | |
54a0048b | 48 | CompareTo::same_as(c, 22) //~ ERROR `C: CompareTo<i32>` is not satisfied |
c34b1796 AL |
49 | } |
50 | ||
51 | fn main() { | |
54a0048b | 52 | assert_eq!(22_i64.same_as(22), true); //~ ERROR `i64: CompareTo<i32>` is not satisfied |
c34b1796 | 53 | } |