| //@ run-pass | |
| pub trait NumCast: Sized { | |
| fn from(i: i32) -> Option<Self>; | |
| } | |
| pub trait NumExt: PartialEq + PartialOrd + NumCast {} | |
| impl NumExt for f32 {} | |
| impl NumCast for f32 { | |
| fn from(i: i32) -> Option<f32> { Some(i as f32) } | |
| } | |
| fn num_eq_one<T: NumExt>(n: T) { | |
| println!("{}", n == NumCast::from(1).unwrap()) | |
| } | |
| pub fn main() { | |
| num_eq_one(1f32); // you need to actually use the function to trigger the ICE | |
| } |