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ea8adc8c | 1 | // Copyright 2017 The Rust Project Developers. See the COPYRIGHT |
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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 | ||
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11 | // run-pass |
12 | ||
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13 | trait Nat { |
14 | const VALUE: usize; | |
ea8adc8c | 15 | } |
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16 | |
17 | struct Zero; | |
18 | struct Succ<N>(N); | |
19 | ||
20 | impl Nat for Zero { | |
21 | const VALUE: usize = 0; | |
22 | } | |
23 | ||
24 | impl<N: Nat> Nat for Succ<N> { | |
25 | const VALUE: usize = N::VALUE + 1; | |
26 | } | |
27 | ||
223e47cc | 28 | fn main() { |
abe05a73 | 29 | let x: [i32; <Succ<Succ<Succ<Succ<Zero>>>>>::VALUE] = [1, 2, 3, 4]; |
223e47cc | 30 | } |