| //@ run-pass | |
| //@ pretty-expanded FIXME #23616 | |
| pub trait NumCast: Sized { | |
| fn from(i: i32) -> Option<Self>; | |
| } | |
| pub trait NumExt: PartialEq + NumCast {} | |
| impl NumExt for f32 {} | |
| impl NumExt for isize {} | |
| impl NumCast for f32 { | |
| fn from(i: i32) -> Option<f32> { Some(i as f32) } | |
| } | |
| impl NumCast for isize { | |
| fn from(i: i32) -> Option<isize> { Some(i as isize) } | |
| } | |
| fn num_eq_one<T:NumExt>() -> T { | |
| NumCast::from(1).unwrap() | |
| } | |
| pub fn main() { | |
| num_eq_one::<isize>(); // you need to actually use the function to trigger the ICE | |
| } |