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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 | ||
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11 | // pretty-expanded FIXME #23616 |
12 | ||
9cc50fc6 | 13 | pub trait NumCast: Sized { |
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14 | fn from(i: i32) -> Option<Self>; |
15 | } | |
223e47cc | 16 | |
1a4d82fc | 17 | pub trait NumExt: PartialEq + NumCast {} |
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18 | |
19 | impl NumExt for f32 {} | |
c34b1796 | 20 | impl NumExt for isize {} |
223e47cc | 21 | |
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22 | impl NumCast for f32 { |
23 | fn from(i: i32) -> Option<f32> { Some(i as f32) } | |
24 | } | |
25 | impl NumCast for isize { | |
26 | fn from(i: i32) -> Option<isize> { Some(i as isize) } | |
27 | } | |
28 | ||
223e47cc | 29 | fn num_eq_one<T:NumExt>() -> T { |
85aaf69f | 30 | NumCast::from(1).unwrap() |
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31 | } |
32 | ||
33 | pub fn main() { | |
c34b1796 | 34 | num_eq_one::<isize>(); // you need to actually use the function to trigger the ICE |
223e47cc | 35 | } |