rust/src/test/run-pass/trait-inheritance-num5.rs

26 lines
766 B
Rust

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::cmp::Eq;
use std::num::NumCast;
pub trait NumExt: Eq + Num + NumCast {}
impl NumExt for f32 {}
impl NumExt for int {}
fn num_eq_one<T:NumExt>() -> T {
NumCast::from(1).unwrap()
}
pub fn main() {
num_eq_one::<int>(); // you need to actually use the function to trigger the ICE
}