| #![feature(no_core, intrinsics, staged_api, lang_items)] |
| #![no_core] |
| |
| #[lang = "sized"] |
| pub trait Sized {} |
| |
| pub trait Number: NumConv { |
| fn from<T: Number>(n: T) -> Self; |
| } |
| |
| trait NumberExt: Number { |
| fn to_double(&self) -> f64 { |
| self.to_float() * 2.0 |
| } |
| } |
| |
| impl<T: Number> NumberExt for T {} |
| |
| impl Number for f64 { |
| fn from<T: Number + NewTrait>(n: T) -> f64 { // { dg-error {bounds not satisfied for f64 .NewTrait. is not satisfied \[E0277\]} } |
| n.to_float() |
| } |
| } |
| |
| pub trait NumConv { |
| fn to_float(&self) -> f64; |
| } |
| |
| impl NumConv for f64 { |
| fn to_float(&self) -> f64 { |
| *self |
| } |
| } |
| |
| pub fn main() { |
| let _: f64 = Number::from(0.0f64); |
| } |
| |
| trait NewTrait { |
| type Assoc; |
| } |
