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.
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.
11 use std::cmp::{PartialEq, PartialOrd};
12 use std::num::NumCast;
14 pub trait NumExt: PartialEq + PartialOrd + Num + NumCast {}
16 impl NumExt for f32 {}
18 fn num_eq_one<T:NumExt>(n: T) {
19 println!("{}", n == NumCast::from(1i).unwrap())
23 num_eq_one(1f32); // you need to actually use the function to trigger the ICE