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1 | // Copyright 2012 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 | trait TraitA { | |
1a4d82fc | 12 | fn method_a(&self) -> isize; |
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13 | } |
14 | ||
15 | trait TraitB { | |
1a4d82fc | 16 | fn gimme_an_a<A:TraitA>(&self, a: A) -> isize; |
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17 | } |
18 | ||
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19 | impl TraitB for isize { |
20 | fn gimme_an_a<A:TraitA>(&self, a: A) -> isize { | |
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21 | a.method_a() + *self |
22 | } | |
23 | } | |
24 | ||
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25 | fn call_it<B:TraitB>(b: B) -> isize { |
26 | let y = 4us; | |
27 | b.gimme_an_a(y) //~ ERROR the trait `TraitA` is not implemented | |
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28 | } |
29 | ||
30 | fn main() { | |
1a4d82fc | 31 | let x = 3is; |
970d7e83 | 32 | assert_eq!(call_it(x), 22); |
223e47cc | 33 | } |