| //@ run-pass |
| |
| #![feature(fn_delegation)] |
| |
| trait Trait: Sized { |
| fn by_value(self) -> i32 { 1 } |
| fn by_mut_ref(&mut self) -> i32 { 2 } |
| fn by_ref(&self) -> i32 { 3 } |
| } |
| |
| #[derive(Default)] |
| struct F; |
| impl Trait for F {} |
| |
| struct S(F); |
| |
| impl Trait for S { |
| reuse Trait::{by_value, by_mut_ref, by_ref} { self.0 } |
| } |
| |
| struct S1(Box<Box<Box<Box<Box<Box<F>>>>>>); |
| |
| impl Trait for S1 { |
| reuse Trait::{by_value, by_mut_ref, by_ref} { self.0 } |
| } |
| |
| fn main() { |
| let mut s = S(F); |
| assert_eq!(s.by_ref(), 3); |
| assert_eq!(s.by_mut_ref(), 2); |
| assert_eq!(s.by_value(), 1); |
| |
| let mut s = S1(Default::default()); |
| assert_eq!(s.by_ref(), 3); |
| assert_eq!(s.by_mut_ref(), 2); |
| assert_eq!(s.by_value(), 1); |
| } |
