| // run-pass |
| |
| // FIXME: uncomment let binding types below when `impl_trait_in_bindings` feature is fixed. |
| |
| #![feature(associated_type_bounds)] |
| |
| use std::ops::Add; |
| |
| trait Tr1 { type As1; fn mk(&self) -> Self::As1; } |
| trait Tr2<'a> { fn tr2(self) -> &'a Self; } |
| |
| fn assert_copy<T: Copy>(x: T) { let _x = x; let _x = x; } |
| fn assert_static<T: 'static>(_: T) {} |
| fn assert_forall_tr2<T: for<'a> Tr2<'a>>(_: T) {} |
| |
| struct S1; |
| #[derive(Copy, Clone)] |
| struct S2; |
| impl Tr1 for S1 { type As1 = S2; fn mk(&self) -> Self::As1 { S2 } } |
| |
| fn def_et1() -> Box<dyn Tr1<As1: Copy>> { |
| let x /* : Box<dyn Tr1<As1: Copy>> */ = Box::new(S1); |
| x |
| } |
| pub fn use_et1() { assert_copy(def_et1().mk()); } |
| |
| fn def_et2() -> Box<dyn Tr1<As1: Send + 'static>> { |
| let x /* : Box<dyn Tr1<As1: Send + 'static>> */ = Box::new(S1); |
| x |
| } |
| pub fn use_et2() { assert_static(def_et2().mk()); } |
| |
| fn def_et3() -> Box<dyn Tr1<As1: Clone + Iterator<Item: Add<u8, Output: Into<u8>>>>> { |
| struct A; |
| impl Tr1 for A { |
| type As1 = core::ops::Range<u8>; |
| fn mk(&self) -> Self::As1 { 0..10 } |
| }; |
| let x /* : Box<dyn Tr1<As1: Clone + Iterator<Item: Add<u8, Output: Into<u8>>>>> */ |
| = Box::new(A); |
| x |
| } |
| pub fn use_et3() { |
| let _0 = def_et3().mk().clone(); |
| let mut s = 0u8; |
| for _1 in _0 { |
| let _2 = _1 + 1u8; |
| s += _2.into(); |
| } |
| assert_eq!(s, (0..10).map(|x| x + 1).sum()); |
| } |
| |
| fn def_et4() -> Box<dyn Tr1<As1: for<'a> Tr2<'a>>> { |
| #[derive(Copy, Clone)] |
| struct A; |
| impl Tr1 for A { |
| type As1 = A; |
| fn mk(&self) -> A { A } |
| } |
| impl<'a> Tr2<'a> for A { |
| fn tr2(self) -> &'a Self { &A } |
| } |
| let x /* : Box<dyn Tr1<As1: for<'a> Tr2<'a>>> */ = Box::new(A); |
| x |
| } |
| pub fn use_et4() { assert_forall_tr2(def_et4().mk()); } |
| |
| fn main() { |
| let _ = use_et1(); |
| let _ = use_et2(); |
| let _ = use_et3(); |
| let _ = use_et4(); |
| } |